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1
Charoenca, Naowarut, and Roger S. Fujioka. "Assessment of Staphylococcus Bacteria in Hawaii's Marine Recreational Waters." Water Science and Technology 27, no. 3-4 (February 1, 1993): 283–89. http://dx.doi.org/10.2166/wst.1993.0361.
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Several media to specifically recover staphylococcus from marine recreational waters in Hawaii were evaluated. The membrane filtration method using Vogel-Johnson and Tellurite Glycine Agar media supplemented with 0.005% sodium azide were shown to quantitatively recover total staphylococcus and S. aureus from marine recreational waters. Beaches in Hawaii were determined to contain high or low concentrations of staphylococci based on Favero's proposed standard of 100 staphylococci/100 ml as the maximum allowable concentration. Statistical analysis of the data showed that levels of total staphylococci were significantly correlated with that of S. aureus and with swimmer density. Staphylococci were recovered from beach waters throughout the day, including evening hours, indicating the stability of these bacteria in marine waters. Moreover, the antibiotic sensitivity patterns and phage types of S. aureus isolates from marine waters and from clinical human skin cultures were similar. These results support the hypothesis that recreational waters can serve as vehicles for the transmission of staphylococcal skin infections.
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HONG, JISOO, JONGUK KIM, LIN-HU QUAN, SUNGGI HEU, and EUNJUNG ROH. "Purification and Characterization of Pasteuricin Produced by Staphylococcus pasteuri RSP-1 and Active against Multidrug-Resistant Staphylococcus aureus." Journal of Food Protection 81, no. 11 (October 3, 2018): 1768–75. http://dx.doi.org/10.4315/0362-028x.jfp-18-111.
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ABSTRACT Staphylococcus aureus is an important pathogen implicated in various diseases, including staphylococcal food poisoning. Bacteriocins are considered safe and effective antimicrobial substances for the prevention of the growth of pathogenic bacteria. In this article, we describe the purification and characterization of pasteuricin, a novel bacteriocin produced by Staphylococcus pasteuri RSP-1. A cell-free supernatant of S. pasteuri RSP-1 exerted strong antimicrobial activity against staphylococci, including methicillin-resistant S. aureus (MRSA), and gram-positive bacteria. The loss of antimicrobial activity upon treatment with proteolytic enzymes confirmed the proteinaceous nature of pasteuricin. A rapid and pronounced bactericidal effect of pasteuricin was confirmed by a live-dead bacterial viability assay. To our knowledge, pasteuricin is the first reported S. pasteuri bacteriocin that inhibits S. aureus. Because pasteuricin is characterized by strong antimicrobial activity and high stability, it has potential as an alternative antimicrobial agent to antibiotics.
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Capparelli, Rosanna, Marianna Parlato, Giorgia Borriello, Paola Salvatore, and Domenico Iannelli. "Experimental Phage Therapy against Staphylococcus aureus in Mice." Antimicrobial Agents and Chemotherapy 51, no. 8 (May 21, 2007): 2765–73. http://dx.doi.org/10.1128/aac.01513-06.
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ABSTRACT The present study describes a bacteriophage (MSa) active against Staphylococcus aureus, including methicillin-resistant staphylococcal strains. When inoculated into mice simultaneously with S. aureus A170 (108 CFU/mouse), phage (109 PFU) rescued 97% of the mice; when applied to nonlethal (5 × 106 CFU/mouse) 10-day infections, the phage also fully cleared the bacteria. The phage MSa, delivered inside macrophages by S. aureus, kills the intracellular staphylococci in vivo and in vitro. The phage can also prevent abscess formation and reduce the bacterial load and weight of abscesses. These results suggest a potential use of the phage for the control of both local and systemic human S. aureus infections.
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Lutpiatina, Leka, and Nisa Nur Agistni Eriana. "Staphylococcus aureus and Methicillin resistant Staphylococcus aureus From The Diabetic Ulcer." Medical Laboratory Technology Journal 4, no. 1 (June 30, 2018): 30. http://dx.doi.org/10.31964/mltj.v4i1.182.
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Infections of diabetic ulcers may occur because patients with diabetes mellitus have a weak immune system and the presence of high blood sugar into a strategic place for bacterial growth one of them is Staphylococcus aureus. Increased resistance of Staphylococcus aureus to various antibiotics, causing problems for the treatment of this infection. As by Methicillin-resistant Staphylococcus aureus (MRSA) This study aims to assess the presence of Staphylococcus aureus and Methicillin-resistant Staphylococcus aureus (MRSA) at diabetic ulcer patient at Banjarmasin city hospital. This research uses descriptive observational research type. The study sample was patients with grade 2 and three diabetic ulcers with a total of 30 samples. The result of the research found 14 Staphylococcus aureus bacteria, Staphylococcus epidermidis nine, Staphylococcus saprophyticus two and 5 Gram-negative bacteria. Of the 14 samples of Staphylococcus aureus, there were eight samples of cefoxitin-resistant samples. The conclusion was 47% of Staphylococcus aureus in patients with a diabetic ulcer at Banjarmasin City Hospital. There was a 57% Methicillin-resistant Staphylococcus aureus in the isolated Staphylococcus aureus found. Need further research on the resistance of antibiotics oxacillin and cefoxitin to other Staphylococcus sp bacteria derived from patient diabetic ulcers.
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Goncagul, Gulsen. "Antimicrobialsusceptibilityof bacteria isolated from goats with subclinical mastitis in the Southern Marmara region of Turkey." Medycyna Weterynaryjna 77, no. 05 (2021): 6527–2021. http://dx.doi.org/10.21521/mw.6527.
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The mastitis of dairy goats is a disease of the economic importance worldwide and is mostly associated with bacterial infections. The aim of this study was to isolate the bacteriae causing subclinical mastitis, and determine to the susceptibility of some clinical isolates against several antimicrobial agents frequently used to control bacterial subclinical mastitis in dairy goats in the Southern Marmara Region. A total of 68 Saanen goats were used for this investigation and subclinical mastitis was determined by using California Mastitis Test. As a result of bacteriological analysis of milk samples, 30 different bacteria species have been identified and non-aureus staphylococci found to be the predominant bacteria species with the rate of 22.1%. The species with the highest isolation rate among the isolates were Escherichia coli (18.9%), Staphylococcus aureus (15.7%), Streptococcus agalactiae (14.2%) and Staphylococcus epidermidis (7.9%). The antimicrobial susceptibility of the high isolation rate species including Escherichia coli, Staphylococcus aureus, Streptococcus agalactiae, Staphylococcus epidermidis, Streptococcus uberis, Enterococcus faecalis, Staphylococcus haemolyticus and Mannheimia haemolytica to twelve antibiotics were determined by disc diffusion method. Bacterial strains analyzed showed highest sensitivity to ofloxacin (87.9%) and followed by cefuroxime (85.8%) and cefazolin (83.6%). In conclusion, subclinical mastitis still remains a problem in dairy goats, and for the elimination of subclinical mastitis, besides protective measures, determination of the bacteriae causing mastitis and their antibiotic sensitivities should be priority.
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Pasachova Garzón, Jennifer, Sara Ramirez Martinez, and L. Muñoz Molina. "Staphylococcus aureus." Nova 17, no. 32 (November 15, 2019): 25–38. http://dx.doi.org/10.22490/24629448.3631.
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Staphylococcus aureus se caracteriza por ser la principal causa de bacteriemia nosocomial en el mundo, debido al incremento en la resistencia, a los diferentes factores de patogenicidad y virulencia y la expresión de una gran variedad de roteínas las cuales pertenecen a las moléculas de la matriz adhesiva (MSCRAMM), presentes en la superficie de la bacteria cuya función es la colonización e invasión celular al hospedero y favorecer la formación de biopelícula, El conjunto de estos mecanismos de patogenicidad y virulencia, le permiten a la bacteria persistir en el huésped y en el ambiente, sobreviviendo a factores adversos, al sistema inmune y a los antimicrobianos.
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Winias, Saka. "EFFECT OF CYNAMMYLDEHYDE FROM CINNAMON EXTRACT AS A NATURAL PRESERVATIVE ALTERNATIVE TO THE GROWTH OF Staphylococcus aureus BACTERIA." Indonesian Journal of Tropical and Infectious Disease 2, no. 1 (July 27, 2015): 38. http://dx.doi.org/10.20473/ijtid.v2i1.188.
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Food is one of the best media for the microorganism to live and grow. Therefore, food is often broken because it has been contaminated by the microorganism. In industry country, approximately 30% of population infected by food borne disease. Food borne disease is caused of phatogen bacteria food borne. Staphylococus aureus is a kind of bacteria that can make food rotten and also it is a phatogen bacteria cause food born disease, no forming spora, positive gram bacteria and the food substance which is contaminated by Staphylococus aureus will cause poisoned becaused of enterotoxin which is heat resisting. Essential oil is antimicrobial and anti bacterial that the most effective, it can inhibit the growing of microba and bacteria. One of the example of essential oil is Cinnamon.sp oil. Cinnamon oil is antimcroba agent for bacteri and fungi because it contain cynammyldehyde and cynammyl alcohol and also eugenol. The aim of this study is to understand the antimcrobacterial potential of cynammyldehyde from cinnamon extract to Staphylococus aureus. This study is laboratory experimantal research. Essential oil from Cinnamon by destilation, then redistilation was done to get cynammyldehyde from cinnamon. Cynammyldehyde was tested to Staphylococus aureus. Test method was done as dilution in the form. From this result, it show that cynammyldehide from cinnamon extract has ability in inhibit the Staphylococus aureus growth. We can conclude that Cynammaldehyde from cinnamon extract has antibacterial effect especially for positive gram bacteria that is Staphylococcus aureus. The optimum inhibiting effort is 0.09%.
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DeLeo, Frank R., and Michael Otto. "An antidote for Staphylococcus aureus pneumonia?" Journal of Experimental Medicine 205, no. 2 (February 11, 2008): 271–74. http://dx.doi.org/10.1084/jem.20080167.
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Methicillin-resistant Staphylococcus aureus (MRSA) is the leading cause of bacterial infections in the United States. Severe invasive MRSA infections, which include pneumonia, are difficult to treat because the bacteria are resistant to antibiotics. A new report now shows that immunization against α-hemolysin (Hla), a cytolytic toxin secreted by most S. aureus strains, protects mice against lethal pneumonia. This finding represents the first successful vaccine strategy for the treatment of staphylococcal pneumonia.
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Edslev, Sofie Marie, Caroline Meyer Olesen, Line Brok Nørreslet, Anna Cäcilia Ingham, Søren Iversen, Berit Lilje, Maja-Lisa Clausen, et al. "Staphylococcal Communities on Skin Are Associated with Atopic Dermatitis and Disease Severity." Microorganisms 9, no. 2 (February 19, 2021): 432. http://dx.doi.org/10.3390/microorganisms9020432.
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The skin microbiota of atopic dermatitis (AD) patients is characterized by increased Staphylococcus aureus colonization, which exacerbates disease symptoms and has been linked to reduced bacterial diversity. Skin bacterial communities in AD patients have mostly been described at family and genus levels, while species-level characterization has been limited. In this study, we investigated the role of the bacteria belonging to the Staphylococcus genus using targeted sequencing of the tuf gene with genus-specific primers. We compared staphylococcal communities on lesional and non-lesional skin of AD patients, as well as AD patients with healthy controls, and determined the absolute abundance of bacteria present at each site. We observed that the staphylococcal community, bacterial alpha diversity, and bacterial densities were similar on lesional and non-lesional skin, whereas AD severity was associated with significant changes in staphylococcal composition. Increased S. aureus, Staphylococcus capitis, and Staphylococcus lugdunensis abundances were correlated with increased severity. Conversely, Staphylococcus hominis abundance was negatively correlated with severity. Furthermore, S. hominis relative abundance was reduced on AD skin compared to healthy skin. In conclusion, various staphylococcal species appear to be important for skin health.
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Berti, Andrew D., Lauren T. Harven, and Victoria Bingley. "Distinct Effectiveness of Oritavancin against Tolerance-Induced Staphylococcus aureus." Antibiotics 9, no. 11 (November 8, 2020): 789. http://dx.doi.org/10.3390/antibiotics9110789.
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Within a sufficiently large bacterial population, some members will naturally adopt an alternate, metabolically-active state that favors small molecule synthesis over cell division. These isogenic “tolerant” subpopulations have variable responses during antibiotic exposure and can remain viable in the presence of typically bactericidal concentrations. In this study, we determine the ability of typical and atypical antistaphylococcal therapies to reduce the viability of mupirocin-induced tolerant Staphylococcus aureus bacteria. Overall, tolerance-induced staphylococci exhibited a markedly decreased rate and extent of killing following antibiotic exposure. However, oritavancin remained effective at maintaining a similar extent of killing. Further studies to investigate the role of oritavancin against recurrent or relapse staphylococcal infection are warranted.
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Janevsкi, Aleksandar, Iskra Cvetkovikj, Sanja Kiprijanovska, Aleksandar Dimovski, Katarina Davalieva, Ljupco Angelovski, Miroslav Kjosevski, and Dine Mitrov. "Prevalence of Subclinical Mastitis Pathogens in Small Dairy Farms in Republic of North Macedonia." Macedonian Veterinary Review 43, no. 1 (March 1, 2020): 23–30. http://dx.doi.org/10.2478/macvetrev-2020-0010.
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AbstractSubclinical mastitis is an asymptomatic udder infection distributed worldwide with enormous losses in the dairy industry. The study’s objective was to determine the presence of this pathological condition in small dairy farms in the R. of N. Macedonia and to identify the most common associated bacteria. Milk samples were obtained from 96 dairy cows (378 udder quarters) in seven dairy farms, in 3 consecutive samplings 24–72 hours apart. The samples were cultured on routine bacteriological growth media and incubated for 24–48 hours. The isolates were identified by AximaiD Plus MALDITOF MS Platform. Subclinical mastitis was found in 49 animals (51%) and 104 infected quarters (27%). The most frequent isolated bacteria on cow level were Streptococcus uberis (19.4%), Staphylococcus haemolyticus (13.4%), Staphylococcus aureus (7.4%) and Staphylococcu ssimulans (7.4%). On quarter level, the most isolated pathogen was Streptococcus uberis (35.6%) followed by Staphylococcu shaemolyticus and Staphylococcus aureus (10.3% and 9.2% respectively). Subclinical mastitis was found to be highly present in the selected small dairy farms. The most prevalent bacteria identified in the dairy farms (Streptococcus uberis, Staphylococcus aureus and coagulase–negative staphylococci) indicate that poor management and udder health practices, inadequate milking procedures and lack of mastitis control strategies greatly contribute to occurrence and persistence of subclinical mastitis.
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Lesmana, Muhamad Arfan, Dahliatul Qosimah, and Sri Murwani. "Detection of Staphylococcus aureus Biofilm from Subclinical Mastitis Milk." Veterinary Biomedical and Clinical Journal 1, no. 1 (January 1, 2019): 19–25. http://dx.doi.org/10.21776/ub.vetbioclinj.2019.001.01.3.
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One of S.aureus's virulence factors is biofilm formation. When biofilms are formed, the bacteria will undergo phenotypic changes that require higher concentrations of antibiotics to inhibit proliferation. Phenotypic changes will lead to increase the production of extracellular matrix and multilayered colonies as well as decrease of metabolic rates, multiplication and polymicrobial colonization resulting in recurrent infection in the host and difficulty being treated with antibiotics due to resistance. The aim of this research was to know the formation of bacterial biofim by slime and quantitative by microplate titer method. The research method was qualitative descriptive using 27 samples of Staphylococcus aureus with characterized from mastitis infected milk. The bacteria were grown on CRA (Congo Red Agar) media to observe the slime biofilm through bacteria black colony followed by MicrotiterPlate method with 570nm wave lenght. The results showed that 27 samples of Staphylococcus aureus which positive to form slime biofilm were 10 samples and continued to microtiter plate showed 3 positive samples of biofilm. The conclusions of this study, Staphylococcus aureus in subclinical mastitis milk samples were positive to form biofilms.
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Liempepas, Angelika, Widya A. Lolo, and Paulina V. Y. Yamlean. "ISOLASI DAN UJI ANTIBAKTERI DARI ISOLAT BAKTERI YANG BERASOSIASI DENGAN SPONS Callyspongia aerizusa SERTA IDENTIFIKASI SECARA BIOKIMIA." PHARMACON 8, no. 2 (May 28, 2019): 380. http://dx.doi.org/10.35799/pha.8.2019.29304.
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ABSTRACT Sponge Callyspongia aerizusa contain potential bioactive compound that can be utilized in the health sector. Extract of sea sponge Callyspongia aerizusa, can hamper the growth of Salmonella typhi bacteria, Streptococcus pyogenes, Shigella and Staphylococcus epidermidis. The aim of this study was to test the antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria and identify the type of symbionic bacteria of Callyspongia aerizusa sponge based on their physiological and biochemical characteristics. The method of testing the antibacterial activity was agar diffusion method (Kirby and Baurer diffusion disc). There were three bacterial isolates namely T1, T2, and T3 isolates. The result showed that T1, T2, and T3bacterial isolates had antibacterial activity against Escherichia coli and Staphylococcus aureus test bacteria. Based on the biochemical test, T2bacterial isolates were identified as Bronchothrix bacteria and T1and T3 bacterial identified as Desulfotomaculum. Keywords: Callyspongia aerizusa, Antibacterial activity, symbiont bacteria, Biochemical Identification ABSTRAKSpons Callyspongia aerizusa memiliki kandungan senyawa bioaktif potensial yang dapat dimanfaatkan dibidang kesehatan. Ekstrak spons laut Callyspongia aerizusa dapat menghambat pertumbuhan bakteri Salmonella typhi, Streptococcus pyogenes, Shigella dan Staphylococcus epidermidis. Penelitian ini bertujuan untuk menguji aktivitas antibakteri dari bakteri simbion spons Callyspongia aerizusa terhadap bakteri Escherichia coli dan Staphylococcuc aureus dan mengidentifikasi jenis bakteri simbion spons Callyspongia aerizusa berdasarkan karakteristik fisiologis dan biokimianya. Metode pengujian aktivitas antibakteri yang digunakan yaitu metode difusi agar (disc diffusion Kirby and Baurer). Terdapat tiga isolat bakteri yaitu isolat T1, T2, dan T3. Hasil penelitian menunjukan bahwa isolat bakteri T1, T2, dan T3 memiliki aktivitas antibakteri terhadap bakteri uji Escherichia coli dan Staphylococcuc aureus. Berdasarkan uji biokima, isolat bakteri T2 diduga sebagai bakteri Brochothrix dan isolat bakteri T1 dan T3 diduga sebagai bakteri Desulfotomaculum.Kata kunci: Callyspongia aerizusa, Aktivitas antibakteri, Bakteri simbion, Identifikasi Biokimia
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Phuyal, Nirmala, Pramod Kumar Jha, Pankaj Prasad Raturi, and Sangeeta Rajbhandary. "In Vitro Antibacterial Activities of Methanolic Extracts of Fruits, Seeds, and Bark of Zanthoxylum armatum DC." Journal of Tropical Medicine 2020 (June 4, 2020): 1–7. http://dx.doi.org/10.1155/2020/2803063.
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Crude methanol extracts of fruits, seeds, and bark of Zanthoxylum armatum were investigated in vitro for antimicrobial activities against 9 different bacterial strains: Bacillus subtilis, Enterococcus faecalis, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Shigella dysenteriae, Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), and Staphylococcus epidermidis using agar well diffusion method, and the MBC values were determined. Only 5 bacteria, i.e., Bacillus subtilis, Enterococcus faecalis, MRSA, Staphylococcus aureus, and Staphylococcus epidermidis exhibited antibacterial properties against the different extracts. The fruit and seed extracts showed activities against 5 bacteria, while the bark extract was active against 2 bacteria only (MRSA and Staphylococcus aureus). Staphylococcus aureus was found to be more susceptible for all the extracts compared to other strains. The maximum ZOI of 20.72 mm was produced by fruits (wild) and 18.10 mm (cultivated) against Staphylococcus aureus. Likewise, the least ZOI of 11.73 mm was produced by seeds (wild) and 11.29 mm (cultivated) against Escherichia faecalis. Similarly, the lowest MBC value of 0.78 mg/mL was obtained for fruit extracts against MRSA, 1.56 mg/mL for fruits, seeds, and bark extracts against Bacillus subtilis, MRSA, and Staphylococcus aureus, and highest value of 50 mg/mL for fruits and seeds extracts against S. epidermidis. The fruits, seeds, and bark extracts of Z. armatum exhibited remarkable antibacterial properties against different pathogenic bacteria causing several diseases, which suggests the potential use of this plant for treating different bacterial diseases such as skin infection, urinary tract infection, dental problems, diarrhea, and dysentery.
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Borodkina, I. V. "BIOLOGICAL CHARACTERISTICS OF STAPHYLOCOCCUS AUREUS ISOLATES RECOVERED FROM MILK AND DAIRY PRODUCTS MANUFACTURED IN THE REPUBLIC OF CRIMEA." Veterinary Science Today, no. 4 (December 26, 2019): 13–18. http://dx.doi.org/10.29326/2304-196x-2019-4-31-13-18.
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Staphylococci are one of the causes of food poisoning in many countries of the world. Intoxication occurs due to staphylococcal exotoxins entering the human body. One of the main sources of staphylococcal toxins is milk and dairy products contaminated with pathogenic staphylococci. Staphylococcus aureus has the greatest sanitary and hygienic importance. In 2016–2018 168 samples of ready-to-eat dairy products were tested for Staphylococcus aureus in the Food Safety Laboratory of the FGBI “ARRIAH” in the Republic of Crimea. The tests were performed according to GOST 30347-2016 “Milk and dairy products. Methods of Staphylococcus aureus detection”. Biochemical properties of the recovered isolates were studied using Vitek 2 Compact analyzer. It was established that the following groups of products are contaminated with Staphylococcus aureus to the greatest extent: butter (20%), sour cream (9.09%), curd and curd products (4.55%), pasteurized milk in the consumer packaging (4.35%). The basic biological characteristics of the isolates have been studied and their antimicrobial resistance has been determined. All the isolated Staphylococcus aureus cultures demonstrated a 100% sensitivity to benzylpenicillin, oxacillin, imipenem, ticarcillin, meropenem, ciprofl oxacin, ofl oxacin, gentamicin, amikacin, doxycycline, tetracycline, rifampin, chloramphenicol, cefotaxime, ceftriaxone, trimethoprim and were 100% resistant to enrofl oxacin. Resistance to streptomycin was determined in 28.6% of isolates, and 14.3% of isolates were resistant to vancomycin. Methicillin-resistant staphylococci were not detected among the bacteria.
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Imanishi, Ichiro, Jumpei Uchiyama, Toshihiro Tsukui, Junzo Hisatsune, Kaori Ide, Shigenobu Matsuzaki, Motoyuki Sugai, and Koji Nishifuji. "Therapeutic Potential of an Endolysin Derived from Kayvirus S25-3 for Staphylococcal Impetigo." Viruses 11, no. 9 (August 22, 2019): 769. http://dx.doi.org/10.3390/v11090769.
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Impetigo is a contagious skin infection predominantly caused by Staphylococcus aureus. Decontamination of S. aureus from the skin is becoming more difficult because of the emergence of antibiotic-resistant strains. Bacteriophage endolysins are less likely to invoke resistance and can eliminate the target bacteria without disturbance of the normal microflora. In this study, we investigated the therapeutic potential of a recombinant endolysin derived from kayvirus S25-3 against staphylococcal impetigo in an experimental setting. First, the recombinant S25-3 endolysin required an incubation period of over 15 minutes to exhibit efficient bactericidal effects against S. aureus. Second, topical application of the recombinant S25-3 endolysin decreased the number of intraepidermal staphylococci and the size of pustules in an experimental mouse model of impetigo. Third, treatment with the recombinant S25-3 endolysin increased the diversity of the skin microbiota in the same mice. Finally, we revealed the genus-specific bacteriolytic effect of recombinant S25-3 endolysin against staphylococci, particularly S. aureus, among human skin commensal bacteria. Therefore, topical treatment with recombinant S25-3 endolysin can be a promising disease management procedure for staphylococcal impetigo by efficient bacteriolysis of S. aureus while improving the cutaneous bacterial microflora.
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Robles, Bruno F., Diego B. Nóbrega, Felipe F. Guimarães, Guido G. Wanderley, and H. Langoni. "Beta-lactamase detection in Staphylococcus aureus and coagulase-negative Staphylococcus isolated from bovine mastitis." Pesquisa Veterinária Brasileira 34, no. 4 (April 2014): 325–28. http://dx.doi.org/10.1590/s0100-736x2014000400004.
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The objectives of the study were to evaluate the presence/production of beta-lactamases by both phenotypic and genotypic methods, verify whether results are dependent of bacteria type (Staphylococcus aureus versus coagulase-negative Staphylococcus - CNS) and verify the agreement between tests. A total of 200 bacteria samples from 21 different herds were enrolled, being 100 CNS and 100 S. aureus. Beta-lactamase presence/detection was performed by different tests (PCR, clover leaf test - CLT, Nitrocefin disk, and in vitro resistance to penicillin). Results of all tests were not dependent of bacteria type (CNS or S. aureus). Several S. aureus beta-lactamase producing isolates were from the same herd. Phenotypic tests excluding in vitro resistance to penicillin showed a strong association measured by the kappa coefficient for both bacteria species. Nitrocefin and CLT are more reliable tests for detecting beta-lactamase production in staphylococci.
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Shen, Jing, Qingfeng Liang, Guanyu Su, Yang Zhang, Zhiqun Wang, Hong Liang, Christophe Baudouin, and Antoine Labbé. "Effect of Ultraviolet Light Irradiation Combined with Riboflavin on Different Bacterial Pathogens from Ocular Surface Infection." Journal of Biophysics 2017 (October 12, 2017): 1–7. http://dx.doi.org/10.1155/2017/3057329.
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In order to study Staphylococcus epidermis and Staphylococcus aureus in vitro viability after the exposure to ultraviolet (UV) light and riboflavin, twelve strains of Staphylococcus epidermis and twelve strains of Staphylococcus aureus were isolated from patients with bacterial keratitis. The growth situation of Staphylococcus epidermidis and Staphylococcus aureus under different experimental conditions was qualitatively observed. The number of colonies surviving bacteria was counted under different UV light power and different exposure time. The experiment showed that there was no inhibition effect on the growth of bacteria using riboflavin alone. In UV alone group and UV-riboflavin group, inhibition effect on the bacteria growth was found. The UV-riboflavin combination had better inhibition effect on bacteria than UV irradiation alone. The amount of bacteria in the UV-riboflavin group was decreased by 99.1%~99.5% and 54.8%~64.6% in the UV alone group, when the UV light power was 10.052 mW/cm2 and the irradiation time was 30 min. Moreover, with the increase of the UV power or irradiation time, the survival rates of bacteria were rapidly reduced. Compared with Staphylococcus aureus, Staphylococcus epidermis was more easily to be killed under the action of UV light combined with riboflavin.
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NAQVI, ZULFIQAR ALI, QAMAR AZIZ, and ARIF MEMON. "STAPHYLOCOCCUS AUREUS;." Professional Medical Journal 20, no. 01 (December 10, 2012): 139–43. http://dx.doi.org/10.29309/tpmj/2013.20.01.587.
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Objective: To determine the prevalence of Staph. aureus in burn patients. Setting: Department of Microbiology, BasicMedical Sciences Institute, Jinnah Postgraduate Medical Centre, Karachi. Period: July 2002 to December 2002. Material and Methods:Out of 52 patients 23 (44%) were found infected by 41 strains of S. aureus in which 10 strains were Methicillin resistant. Results: AllMethicillin sensitive and resistant strains were sensitive to Vancomycin and Chloramphenicol. Other effective drugs against MSSA wereImipenem (93.5%), Cephalothin (77.5%), Clindamycin (68%) while MRSA strains were highly resistant to all other drugs. Conclusions:Gram positive heavily colonize the wound at initial days following burn injury. Once Staph aureus specially MRSA establishing in burn unit,it is very difficult to eradicate these bacteria from burn unit. It is therefore all efforts must made to prevent burn patients from infectionspecially Staph. Aureus infection, by establising infection control team these burn units.
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Dewi, Firnanda Iptita, and Manik Retno Wahyunitisari. "INHIBITORY ACTIVITY OF ZINGIBER OFFICINALE VAR RUBRUM EXTRACT AGAINST STAPHYLOCOCCUS AUREUS." Journal Of Vocational Health Studies 1, no. 3 (September 14, 2018): 113. http://dx.doi.org/10.20473/jvhs.v1.i3.2018.113-116.
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Background: gram-negative bacteria-salmonella typhi and gram-positive bacteria-staphylococcus aureus are types of bacteria that cause infectious disease among several areas in Indonesia. Staphylococcus aureus often found in skin lesions injury. Red ginger extract (Zingiber officinale var rubrum) has been known for its medicinal value especially as an antibacterial agent. Purpose: This study aims to test the ability of Zingiber officinale var rubrum on inhibiting the growth of Staphylococcus aureus. Methods: the activity of the antibacterial agent was calculated based on Minimum Inhibitory Concentration (MIC) using dilution method. Minimum Inhibitory Concentration of extract was determined by incubating bacteria with the extract overnight at 37 0C. Changes in turbidity and inhibition on bacterial growth were then observed. Result: The results show that minimum concentration for inhibitory effect was 1000 μg/mL.Conclusion: extract of Zingiber officinale var rubrum have an inhibitory effect on the growth of Staphylococcus aureus but no activity of killing bacterial was observed on the concentration given.
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Aslam, Nadia, Nazma Kiran, Naima Mehdi, Mateen Izhar, Tanveer Zia, and Hadiqa Tul Hafsa. "FREQUENCY OF STAPHYLOCOCCUS AUREUS IN BLOOD STREAM INFECTIONS AND THEIR DRUG SUSCEPTIBILITY PATTERN." Gomal Journal of Medical Sciences 17, no. 1 (March 31, 2019): 19–22. http://dx.doi.org/10.46903/gjms/17.01.1981.
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Background: Staphylococcus aureus is important cause of blood stream infections. The objectives of this study were to determine the frequency of Staphylococcus aureus in blood stream infections and their antimicrobial drug susceptibility pattern. Materials & Methods: This cross-sectional study was conducted at the Department of Pathology, Shaikh Zayed Hospital, Lahore from April 2018 to March 2019. The sample size was 1527 positive blood cultures for bacteria selected through consecutive sampling technique. Research variables were; presence of positive blood cultures, presence of staphylococci in positive blood cultures, types of staphylococci and types of staphylococcus aereus. Frequency and percentage of blood stream infection caused by Staphylococcus aureus and susceptibility of Staphylococcus aureus to various antimicrobial drugs was detected by disc diffusion and e-strip method. Results: Out of 12744 blood cultures, 1527(11.98%) were positive for bacteria. Out of these 1527, 339(22.20%) were positive for staphylococci. Out of these 339, 87 (5.69%) were staphylococcus aureus. Out of these 87, 48 (3.14%) were methicillin resistant (MRSA). Susceptibility of S. aureus isolates to various commonly used drugs was also detected. Conclusion: Staphylococcus aureus is a significant cause of blood stream infection and can exhibit multi-drug resistance. Therefore drug susceptibility profile of pathogens prevalent in hospital should be monitored and kept in mind when prescribing antimicrobial drugs before getting results of antimicrobial drug susceptibility tests.
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Qazi, S. N. A., S. E. Harrison, T. Self, P. Williams, and P. J. Hill. "Real-Time Monitoring of Intracellular Staphylococcus aureus Replication." Journal of Bacteriology 186, no. 4 (February 15, 2004): 1065–77. http://dx.doi.org/10.1128/jb.186.4.1065-1077.2004.
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ABSTRACT A high-throughput system to rapidly assess the intracellular replication of Staphylococcus aureus has been developed utilizing S. aureus transformed with a dual gfp-luxABCDE reporter operon under the control of a growth-dependent promoter. Replication of tagged bacteria internalized into bovine mammary epithelial cells (MAC-T) could be measured by monitoring fluorescence and bioluminescence from the reporter operon following removal of extracellular bacteria from the plates. Bacterial replication inside cells was confirmed by a novel ex vivo time-lapse confocal microscopic method. This assay of bacterial replication was used to evaluate the efficacy of antibiotics which are commonly used to treat staphylococcal infections. Not all antibiotics tested were able to prevent intracellular replication of S. aureus and some were ineffective at preventing replication of intracellular bacteria at concentrations above the MIC determined for bacteria in broth culture. Comparison of the fluorescence and bioluminescence signals from the bacteria enabled effects on protein synthesis and metabolism to be discriminated and gave information on the entry of compounds into the eukaryotic cell, even if bacterial replication was not prevented. Elevated resistance of S. aureus to antibiotics inside host cells increases the likelihood of selecting S. aureus strains which are resistant to commonly used antimicrobial agents within the intracellular niche. The approach presented directly assesses intracellular efficacy of antibiotics and provides an evidence-based approach to antibiotic selection for prescribing physicians and medical microbiologists.
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Surewaard, Bas G. J., Justin F. Deniset, Franz J. Zemp, Matthias Amrein, Michael Otto, John Conly, Abdelwahab Omri, Robin M. Yates, and Paul Kubes. "Identification and treatment of the Staphylococcus aureus reservoir in vivo." Journal of Experimental Medicine 213, no. 7 (June 20, 2016): 1141–51. http://dx.doi.org/10.1084/jem.20160334.
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Methicillin-resistant Staphylococcus aureus (MRSA) bacteremia is reaching epidemic proportions causing morbidity, mortality, and chronic disease due to relapses, suggesting an intracellular reservoir. Using spinning-disk confocal intravital microscopy to track MRSA-GFP in vivo, we identified that within minutes after intravenous infection MRSA is primarily sequestered and killed by intravascular Kupffer cells (KCs) in the liver. However, a minority of the Staphylococci overcome the KC’s antimicrobial defenses. These bacteria survive and proliferate for many days within this intracellular niche, where they remain undetected by recruited neutrophils. Over time, the KCs lyse, releasing bacteria into the circulation, enabling dissemination to other organs such as the kidneys. Vancomycin, the antibiotic of choice to treat MRSA bacteremia, could not penetrate the KCs to eradicate intracellular MRSA. However, based on the intravascular location of these specific macrophages, we designed a liposomal formulation of vancomycin that is efficiently taken up by KCs and diminished the intracellular MRSA. Targeting the source of the reservoir dramatically protected the liver but also dissemination to other organs, and prevented mortality. This vancomycin formulation strategy could help treat patients with Staphylococcal bacteremia without a need for novel antibiotics by targeting the previously inaccessible intracellular reservoir in KCs.
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He, Nan, Juan Zhou, Miyun Hu, Changyang Ma, and Wenyi Kang. "The mechanism of antibacterial activity of corylifolinin against three clinical bacteria from Psoralen corylifolia L." Open Chemistry 16, no. 1 (September 3, 2018): 882–89. http://dx.doi.org/10.1515/chem-2018-0091.
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AbstractEffective antibacterial activity against Grampositive bacteria isolated in clinical strains was exhibited when corylifolinin was tested using the Disc diffusion method (K-B method). Minimum inhibitory concentration (MIC) of corylifolinin against Staphylococcus aureus (SA), Methcillin-resistant Staphylococcus aureus (MRSA) and extended spectrum β-lactamases Staphylococcus aureus (ESBLs-SA) were 0.078, 0.156 and 0.078 mg/mL, respectively. The minimum bactericide concentrations (MBCs) were 0.156, 0.156 and 0.078 mg/mL respectively. Scanning electron microscopy (SEM), alkaline phosphatase (AKP) and bacterial extracellular protein leakage were used to investigate the antibacterial mechanism of corylifolinin. After adding corylifolinin at the MBC level, there were obvious changes to the Staphylococcus aureus of bacteria cells. Both MIC level and MBC levels of corylifolinin led to the leakage of AKP and bacterial extracellular protein.
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Prabasari, Pramesti Indah, I. M. Sumarya, and N. K. A. Juliasih. "DAYA HAMBAT EKSTRAK LIDAH BUAYA (Aloe barbadensis Miller) TERHADAP PERTUMBUHAN BAKTERI Staphylococcus aureus SECARA IN VITRO." JURNAL WIDYA BIOLOGI 10, no. 01 (January 8, 2019): 23–32. http://dx.doi.org/10.32795/widyabiologi.v10i01.234.
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Aloe vera (Aloe barbadensis Miller) contains anthraquinone compounds, flavonoids and saponins which are thought to have antibacterial effects so as to inhibit bacterial growth. The purpose of the study was to determine the inhibitory power of Aloe barbadensis Miller on the growth of Staphylococcus aureus bacteria. The pure experimental study was conducted with The Randomized Posttest Only Control Group Design using six (6) treatments, namely aloe vera extract with a concentration of 25%, 50%, 75%, 100%, Chloramphenicol 30 mcg antibiotics as a positive control, and sterile aquadest as a control negative for Staphylococcus aureus bacteria grown on Mueller Hinton media. After being treated, it was incubated for 24 hours and measured its inhibitory power. The growth inhibition data of Staphylococcus aureus bacteria in the form of inhibition zone diameter was analyzed statistically by Kruskal Wallis test, at the level of confidence α = 0.05. The results showed that the average inhibitory effect of Aloe vera extract on the growth of Staphylococcus aureus bacteria in concentrations of 25%, 50%, 75% and 100% were 0 ± 0 mm; 7.125 ± 0.1250 mm; 8.375 ± 0.23936 mm; and 9.0 ± 0.40825 mm. Based on the results of the study concluded that aloe vera extract can inhibit the growth of Staphylococcus aureus bacteria. The higher the concentration of Aloe vera extract the greater the inhibitory effect on the growth of Staphylococcus aureus bacteria.
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Craft, Kelly M., Johny M. Nguyen, Lawrence J. Berg, and Steven D. Townsend. "Methicillin-resistant Staphylococcus aureus (MRSA): antibiotic-resistance and the biofilm phenotype." MedChemComm 10, no. 8 (2019): 1231–41. http://dx.doi.org/10.1039/c9md00044e.
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Rahim, Abdul Rahim. "AKTIVITAS ANTIBAKTERI FRAKSI DAUN CABE RAWIT (Capsicum frutescens L.) TERHADAP BAKTERI Staphylococcus aureus." Pharmacoscript 3, no. 2 (August 31, 2020): 134–42. http://dx.doi.org/10.36423/pharmacoscript.v3i2.509.
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ABSTRACTStaphylococcus aureus is a normal bacterial flora found on the skin and mucous membranes of humans. Staphylococcus aureus bacteria can also overgrow and invade under certain conditions, act as pathogenic bacteria that cause various diseases or disorders in the body, one of which is a respiratory tract infection. The cayenne pepper plant is widely used by people in the cayenne pepper fruit section as a spice ingredient in various traditional dishes, however, the cayenne pepper leaves are still not widely used. Cayenne pepper leaves contain saponin and phenol group compounds, namely flavonoids, which have inhibitory activity against Staphylococcus aureus bacteria. The purpose of this study was to determine the most active fraction inhibiting the growth of staphylococcus aureus bacteria in vitro. It carried testing the antibacterial activity of the test plants out by the solid diffusion method. The results showed that the ethyl acetate extract fraction from cayenne pepper leaves (Capsicum frutescent L.) Was the most active antibacterial fraction against staphylococcus aureus bacteria with a minimum inhibitory level (MIC) of 10% w / v with a very strong category.
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Abdul Halim, Nabila Huda, Nur Syarafina Mohd Zahir, Nor Munirah Mohd Amin, and Hanani Ahmad Yusof @ Hanafi. "Distribution of Hyaluronidase-producing Staphylococcus aureus and Staphylococcus epidermidis Isolated from Palm Skin and Anterior Nares of Healthy Malaysian Adults." Journal of Clinical and Health Sciences 5, no. 1 (June 23, 2020): 42. http://dx.doi.org/10.24191/jchs.v5i1.9820.
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Introduction: The distribution of Staphylococcus aureus and Staphylococcus epidermidis among Malaysian healthy adults and their capability to produce enzyme hyaluronidase are less reported. Hyaluronidase degrade hyaluronic acid in animal connective tissue and facilitate bacterial spreading in host body. This study aims to identify the distribution of both Staphylococci species in healthy subject, the hyaluronidase producer among the isolates and the association of the latter with site of isolation (palm skin and anterior nares) and gender ofthe host. Methods: A total of 108 swab samples were collected from anterior nares and palm of 54 healthy subjects. The bacteria were identified through microscopic and biochemical tests, before screened for hyaluronidase production using hyaluronic acid diffusion rapid plate method. Results: Total of 139 bacterial isolates were identified; 68 isolates are S. aureus, 63 S. epidermidis and 8 other bacterial species. Staphylococcus aureus was highly isolated from palm (57%) than anterior nares (47%). On the contrary for S. epidermidis was highly isolated from anterior nares (53%) than from palm skin (43%). Equal proportion was found for both species in male and female subject. A total of 77 (59%) isolates produced hyaluronidase; 55%are S. aureus and 45% are S. epidermidis. Hyaluronidase-producer isolates are equally found between anterior nares (56%) and palm skin (61%) or male (57%) and female subject (60%) regardless of Staphylococcal species. No significant value was recorded for any analysis. Conclusion: Capability of commensal S. aureus and S. epidermidis isolated from healthy subject to produce hyaluronidase may indicate their potential as opportunistic pathogen whenever the opportunity arises in any way.
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Dayoh, Paul, Endang Isbandiati, and Titien Rahayu. "ANTIBACTERIAL EFFECT OF GNETUM GNEMON L. LEAVES EXTRACT ON STAPHYLOCOCCUS AUREUS." Journal Widya Medika Junior 3, no. 2 (April 30, 2021): 122–30. http://dx.doi.org/10.33508/jwmj.v3i2.3187.
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Introduction: Bacterial infections are common among doctors in Indonesia, leading to increased use of antibiotics. Increased use of antibiotics, if not accompanied by rational indication, can increase bacterial resistance. At present, alternative medicine from natural ingredients is widely studied, one of which is the leaves of melinjo (Gnetum gnemon L.). Melinjo leaves are thought to contain antibacterial compounds such as flavonoids, tannins, saponins, and alkaloids. Staphylococcus aureus is a round Gram-positive bacteria, that forms grape-like clusters. Staphylococcus aureus is a normal flora on the skin and human mucosa but can be opportunistic pathogens that cause mild to severe infections such as sepsis. Pathogenic Staphylococcus aureus can produce hemolysis blood, frozen plasma, and produce various extracellular enzymes and toxins. Purpose: This research aims to study the MIC and MBC of melinjo leaves extract on the growth of Staphylococcus aureus bacteria. This research is an experimental study with a posttest control group design. Method: Testing conducted using the microdilution method. Melinjo leaves used were extracted by maceration method using 96% ethanol. Samples were Staphylococcus aureus ATCC 25923 from BBLK Surabaya. Results: extract of melinjo leaves (Gnetum gnemon L.) had MIC on Staphylococcus aureus bacteria at a concentration of 640 mg/ml. MBC was not obtained because the extract of melinjo leaves clotted above 1280 mg/ml concentration. Conclusion: Melinjo leaves extract has an antibacterial effect against Staphylococcus aureus, the MIC is obtained at a concentration of 640 mg/ml, and the MBC cannot be determined.
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Djohari, Meiriza, Wulandari Yulia Putri, and Erniza Pratiwi. "ISOLASI DAN UJI AKTIVITAS DAYA HAMBAT EKSTRAK ETANOL BIJI PINANG (Areca catechu L.) TERHADAP BAKTERI PADA LIDAH." Jurnal Riset Kefarmasian Indonesia 1, no. 3 (September 12, 2019): 177–88. http://dx.doi.org/10.33759/jrki.v1i3.57.
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Betel nut (Areca catechu L.) is a natural material that has antibacterial activity in treating diseased on teeth, halitosis and can inhibit of dental caries. The objective of this research is type of bacteria based on morphology, the results of bacterial identification tests on the tongue and to determine the effect of the inhibitory power of betel nut ethanol extract (Areca catechu L.) to bacteria of the tongue. Antibacterial activity testing using disc diffusion method with various concentrations of 10%, 20% and 30%. Secondary metabolite contents are alkaloid, terpenoid and flavonoid.The results obtained from the identification test based on the color of bacteria Branhamella catarrhalis, Staphylococcus epidermidis and Straphylococcus aureus. Ethanol extract of areca nut (Areca catechu L.) is better to inhibiting the growth of Staphylococcus epidermidis and Staphylococcus aureus compared to Branhamella catarrhalis. Based on Two Way Anova statistical data on inhibitory zone diameters, there were differences between the concentration groups of 10%, 20% and 30% and there were significant differences in the inhibitory activity of Branhamella catarrhalis bacteria compared to Staphylococcus epidermidis and Straphylococcus aureus bacteria but not significantly different between Staphylococcus epidermidis and Straphylococcus aureus bacteria
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Utami, Linda Putri, Peter Gunawan Tandean, and Liliawanti Liliawanti. "Pengaruh Pemberian Ekstrak Kencur (Kaempferia galanga L.) terhadap Peningkatan Zona Hambat Pertumbuhan Bakteri Staphylococcus aureus." Jurnal Ilmiah Kedokteran Wijaya Kusuma 9, no. 2 (October 1, 2020): 145. http://dx.doi.org/10.30742/jikw.v9i2.883.
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The prevalence of infectious diseases in Indonesia is still relatively high, for example Infection caused by Staphylococcus aureus. Indonesia has many traditional plants that can be used for herbal treatments containing tannins, flavonoids, and essential oils which have relatively high antibacterial activity by forming inhibitory zones in the Staphylococcus aureus bacteria which are the cause of skin infections food poisoning to systemic infections. Thereforekencur can be used as an alternative medicine. This study was intented to determine the effect of giving kencur extract (Kaempferia galanga L.) In inhibiting the growth of Staphylococcus aureus bacteria. This study was experimental laboratory used plate diffusion method of “Postest Ony Control Group Design” design. There were 7 groups, 5 treatment groups and 2 control groups. The concentration of treatment group was 100%, 50%, 25%, 12,5%, 6,25% while for positive control using amoxicillin 25μg and aquadest as negative control. The bacterial used were Staphylococcus aureus. The results showed that kencur extract (Kaempferia galanga L.) had an antibacterial effect in inhibiting the growth of Staphylococcus aureus bacteria.With a value of p = 0.001 or p <α. kencur extract (Kaempferia galanga L.) has an antibacterial effect in inhibiting the growth of Staphylococcus aureus bacteria.
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Tak, Vibhor, Purva Mathur, Sanjeev Lalwani, and Mahesh Chandra Misra. "Staphylococcal Blood Stream Infections: Epidemiology, Resistance Pattern and Outcome at a Level 1 Indian Trauma Care Center." Journal of Laboratory Physicians 5, no. 01 (January 2013): 46–50. http://dx.doi.org/10.4103/0974-2727.115939.
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ABSTRACT Purpose: Blood stream infection (BSI)/bacteremia is a potentially life threatening infection and are associated with a high crude mortality. Coagulase negative Staphylococcus (CONS) and Staphylococcus aureus are the most commonly isolated gram positive bacteria from blood culture samples. While S. aureus is a known pathogen causing BSIs, CONS are considered to be common contaminants of blood culture. Of late many studies have challenged this traditional viewpoint. The aim of this study was to determine the epidemiology and significance of Staphylococcus aureus and CONS bacteremia, their resistance patterns and associated mortality in critically ill trauma patients admitted to a level 1 trauma center. Materials and Methods: The study was conducted from January 2009 to June 2011. All patients from whose blood samples yielded a S. aureus or CONS on culture were included in this study. A detailed history was obtained and follow-up of the patients was done. The isolates of Staphylococci were identified to species level. Antibiotic susceptibility was performed by the disc diffusion method and VITEK-2 system. Results: During this 30 month period, total of 10,509 blood samples were received from 2,938 patients. A total of 1,961 samples taken from 905 patients were positive for one or more pathogens. S. aureus/CONS were isolated from 469 samples from 374 patients. Crude mortality amongst the patients having Staphylococcal BSI was 25% (94/374). Conclusion: Staphylococcal blood stream infections are a leading cause of morbidity and mortality.
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Martykanova, Dilyara, Ilya Zemlenuhin, Ollga Reshetnik, Dilyara Kamaldinova, and Nailya Davletova. "Sensitivity of staphylococcus microflora of wrestlers’ skin to bacteriophages." SCIENCE AND SPORT: current trends 7, no. 3 (September 2019): 136–41. http://dx.doi.org/10.36028/2308-8826-2019-7-3-136-141.
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The purpose of this study was to identify the characteristics of bacteriocenosis of wrestlers’ skin and to determine the sensitivity of staphylococcal microflora to bacteriophages. Methods and organization of the research. The experiment involved 15 athletes aged 17-21 years engaged in national wrestling and belt wrestling. Qualifications ranged from 1st adult rank to the master of sports. We used the method of microbiological seeding on yolk-salt agar (JSA) to analyze the washes from the intact skin of the medial part of forearms of wrestlers before and immediately after training. We identified the grown colonies of microorganisms using MALDI Microflex Biotyper mass-spectrometer (Bruker, Germany). In addition to the total microbial abundance, the frequency of occurrence of hemolytic forms of bacteria on wrestlers’ skin was determined before and after training. We determined the sensitivity of Staphylococcus aureus bacteria to staphylococcal bacteriophage and polyvalent pyobacteriophage by the diameter of the bacteria lysis zone. Results and discussion. The research revealed the following facts. 1) S. aureus appears more often than other staphylococci on the skin of the medial part of wrestlers’ forearms both before and after training. 2) We detected high frequency of occurrence of hemolytic forms of Staphylococcus bacteria, which indicates the dysbiosis of wrestlers’ skin. 3) It is more efficient to use a staphylococcal bacteriophage than polyvalent pyobacteriophage for the prevention and treatment of infectious diseases of wrestlers’ skin caused by S. aureus. Conclusion. Athletes of contact sports demonstrate an increased risk of skin infectious diseases, and they need effective means of protection and prevention.
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Tamiyakul, Hathaichanok, Somboon Tanasupawat, Stephan Thierry Dubas, and Warangkana Warisnoicharoen. "Antibacterial Potential of Silver Nanoparticles Capped with Poly(4-styrenesulfonic acid-co-maleic acid) Polymer." Advanced Materials Research 1088 (February 2015): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.64.
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Antibacterial potential of metallic silver nanoparticles (AgNPs) is considered to be influenced by their size and stability. In this study, the stable AgNPs capped with poly (4-styrenesulfonic acid-co-maleic acid) or PSSMA were successfully synthesized by using a chemical reduction method. The PSSMA-stabilized AgNPs (PSSMA-AgNPs) were characterized and tested for antibacterial activity against eight bacterial strains. Transmission electron microscopic studies showed that PSSMA-AgNPs were monodisperse spherical particles with an average size of 5.21 nm. From bacterial growth curve studies, PSSMA-AgNPs exhibited an antibacterial effect on Gram-positive bacteria (Staphylococcus aureus ATCC 25923, Staphylococcus aureus ATCC 6538p, Staphylococcus aureus ATCC 43300, Staphylococcus epidermidis ATCC 12228 and Bacillus subtilis ATCC 6633) and Gram-negative bacteria (Escherichia coli ATCC 25922, Enterobacter aerogenes ATCC 13048 and Pseudomonas aeruginosa ATCC 27853). Moreover, the Gram-negative bacteria were found to be more susceptible to the AgNPs.
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Rahmawati, Rahmawati, Eva Apriliana, and Agus Agus. "Identifikasi Staphylococcus aureus pada Daging Ayam yang Dijual di Pasar Besar Kota Palangka Raya." Borneo Journal of Medical Laboratory Technology 1, no. 1 (January 2, 2019): 13–16. http://dx.doi.org/10.33084/bjmlt.v1i1.459.
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Staphylococcus aureus can be a cause of food poisoning in humans. This type of bacteria can produce enterotoxins that cause contaminated food and poisoning in humans. The toxin produced is resistant in high temperatures, although the bacteria die by heating but the resulting toxin will not be damaged and can still change despite freezing or freezing. Staphylococcus aureus is commonly found in high-protein foods such as egg and chicken products. The purpose of this study was to investigate the contamination of Staphylococcus aureus bacteria in chicken meat sold in Pasar Besar Kota Palangka Raya in 2018. The examination using MSA media (Mannitol Salt Agar) because MSA media is different selective media to differentiate Staphylococcus aureus with Staphylococcus epidermidis. The results of analysis of chicken meat in Pasar Besar Kota Palangka Raya 20% positive contaminated Staphylococcus aureus bacteria in the first-day sample. In the second day, the sample found 13.3% positive contaminated Staphylococcus aureus bacteria.
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Amalia, Amalia, Ratih Dewi Dwiyanti, and Haitami Haitami. "Daya Hambat NaCl terhadap Pertumbuhan Staphylococcus aureus." Medical Laboratory Technology Journal 2, no. 2 (December 31, 2016): 42. http://dx.doi.org/10.31964/mltj.v2i2.125.
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<p style="text-align: justify;">Staphylococcus aureus is a pathogenic bacterial that causes infectious disease and human poisoning through enterotoxin produced by the bacteria. Salt or sodium chloride is used by human for food preservation process because it can inhibit the growth of bacteria, especially Staphylococcus aureus. The purposes of the study were to determine the effect of NaCl in media on the growth of Staphylococcus aureus and determine the effective concentration of NaCl. The type of research used in this study was true experiment posttest only control group design. Samples were prepared in 5 NaCl concentrations, they were 10%, 15%, 20%, 25% dan 30%. The study conclusion was there were effects of NaCl addition to the media on the growth of Staphylococcus aureus with a significance value of 0.000 (<0.05). The effective NaCl concentration that inhibited the growth of Staphylococcus aureus is 15%. The advice for next study is to conduct similar studies with NaCl concentration of 10% - 15%.
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Jurcevic, Alen, and Andrej Pengov. "Staphylococcus aureus effect of different factors on mammary gland infection with staphylococcus aureus bacteria." Veterinarski glasnik 58, no. 1-2 (2004): 85–93. http://dx.doi.org/10.2298/vetgl0402085j.
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The objective of our investigation was to determine how certain factors (the environment, treatment, prevention, animal) affect udder infection with Staphylococcus aureurs (S. aureus) bacteria. A questionnaire investigated the effect of different factors on the frequency of infection with S. aureus bacteria. We established that prevention, treatment on the basis of results of bacteriological examinations and antibiograms, and the elimination of the negative influence of the environment, form a basis for reducing the frequency of udder infections. We verified the questionannire results with the variant analysis method and established that the effect of the environment significantly digresses from the other factors (prevention treatment and diagnosis, animal). Our results show that the breeder, with good prevention and good treatment of mastitis, often disregards the effects of the barn and the environment in which the cows are maintained. Poor barn conditions have a negative effect on cow resistance and at the same time enable the existence and multiplication of pathogenic species of bacteria. In addition to the maintenance conditions, one must not forget prevention and therapy of mammary gland inflammation, either. On the grounds of our previous investigations (Pengov et al., 2000), we recommend for the therapy of mammary gland inflammation the use of a combination of amoxicillin and clavulonic acid, and as prevention of mammary gland inflammation the use of an udder ointment.
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Phong, Lounh Theo, and Nha Thoy Lum. "Psidium Guajava L. Extract Against Minimum Inhibitory Concentration of Staphylococcus Aureus." Journal of Asian Multicultural Research for Medical and Health Science Study 2, no. 3 (July 12, 2021): 22–26. http://dx.doi.org/10.47616/jamrmhss.v2i3.159.
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The aim of this research was to evaluate the effects on the growth of Staphylococcus Aureus bacteria in vitro of antibacterial activity of guayava leaf extract (Psidium guajava L.) and guavava leaf extract impact on the growth of staphylococcus Aureus bacteria at different laboratory concentrations. In this experiment, S. Aureus bacteria are being treated to guava leaf extract to identify the lowest inhibitory power for well techniques, and the results have been recorded. The Guava leaf extract (Psidium Guajava L) against Staphylococcus aureus was found to have an inhibitory zone diameter of mm in the absence of tetracycline, and DMSO as a negative control. Findings were observed using the disk diffusion technique or paper disc with concentrations of 1 percent, 3 percent, 5 percent, and 7 percent. Saponins, saponins, alkaloids, and flavonoids found in guava leaves are responsible for their antibacterial effects. Saponins have the potential to disturb the integrity of bacterial cell membranes. This results in bacterial cell membrane destruction, releasing essential components from the cell
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Nader, Danielle, Fajer Yousef, Nicola Kavanagh, Benedict K. Ryan, and Steven W. Kerrigan. "Targeting Internalized Staphylococcus aureus Using Vancomycin-Loaded Nanoparticles to Treat Recurrent Bloodstream Infections." Antibiotics 10, no. 5 (May 14, 2021): 581. http://dx.doi.org/10.3390/antibiotics10050581.
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The bacterial pathogen Staphylococcus aureus is a leading cause of bloodstream infections, where patients often suffer from relapse despite antibiotic therapy. Traditional anti-staphylococcal drugs display reduced effectivity against internalised bacteria, but nanoparticles conjugated with antibiotics can overcome these challenges. In the present study, we aimed to characterise the internalisation and re-emergence of S. aureus from human endothelial cells and construct a new formulation of nanoparticles that target intracellular bacteria. Using an in vitro infection model, we demonstrated that S. aureus invades and persists within endothelial cells, mediated through bacterial extracellular surface adhesion, Fibronectin-binding protein A/B. After internalising, S. aureus localises to vacuoles as determined by transmission electron microscopy. Viable S. aureus emerges from endothelial cells after 48 h, supporting the notion that intracellular persistence contributes to infection relapses during bloodstream infections. Poly lactic-co-glycolic acid nanoparticles were formulated using a water-in-oil double emulsion method, which loaded 10% vancomycin HCl with 82.85% ± 12 encapsulation efficiency. These non-toxic nanoparticles were successfully taken up by cells and demonstrated a biphasic controlled release of 91 ± 4% vancomycin. They significantly reduced S. aureus intracellular growth within infected endothelial cells, which suggests future potential applications for targeting internalised bacteria and reducing mortality associated with bacteraemia.
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Lee, Jaewook, Eun-Young Lee, Si-Hyun Kim, Dae-Kyum Kim, Kyong-Su Park, Kwang Pyo Kim, Yoon-Keun Kim, Tae-Young Roh, and Yong Song Gho. "Staphylococcus aureus Extracellular Vesicles Carry Biologically Active β-Lactamase." Antimicrobial Agents and Chemotherapy 57, no. 6 (March 25, 2013): 2589–95. http://dx.doi.org/10.1128/aac.00522-12.
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ABSTRACTGram-positive bacteria naturally produce extracellular vesicles. However, little is known regarding the functions of Gram-positive bacterial extracellular vesicles, especially in the bacterial community. Here, we investigated the role ofStaphylococcus aureusextracellular vesicles in interbacterial communication to cope with antibiotic stress. We found thatS. aureusliberated BlaZ, a β-lactamase protein, via extracellular vesicles. These extracellular vesicles enabled other ampicillin-susceptible Gram-negative and Gram-positive bacteria to survive in the presence of ampicillin. However,S. aureusextracellular vesicles did not mediate the survival of tetracycline-, chloramphenicol-, or kanamycin-susceptible bacteria. Moreover,S. aureusextracellular vesicles did not contain theblaZgene. In addition, the heat-treatedS. aureusextracellular vesicles did not mediate the survival of ampicillin-susceptible bacteria. The β-lactamase activities ofS. aureussoluble and extracellular vesicle-associated BlaZ were similar, but only the extracellular vesicle-associated BlaZ was resistant to protease digestion, which suggests that the enzymatic activity of BlaZ in extracellular vesicles is largely protected by the vesicle structure. Our observations provide evidence of the important role ofS. aureusextracellular vesicles in antibiotic resistance, which allows the polymicrobial community to continue to evolve and prosper against antibiotics.
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Mailia, Reny, Bara Yudhistira, Yudi Pranoto, Saiful Rochdyanto, and Endang Sutriswati Rahayu. "KETAHANAN PANAS CEMARAN Escherichia coli, Staphylococcus aureus, Bacillus cereus dan BAKTERI PEMBENTUK SPORA YANG DIISOLASI DARI PROSES PEMBUATAN TAHU DI SUDAGARAN YOGYAKARTA." Jurnal Agritech 35, no. 03 (October 6, 2015): 300. http://dx.doi.org/10.22146/agritech.9341.
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Characteristics of tofu with higher a (0.89 to 0.90) and protein levels of 8% or more, made tofu to be a suitable medium for bacterial growth. This leads to out to be very easy to damage due to bacterial contamination. Contamination of bacteria is commonly found in the tofu because of contamination in the process making of tofu. Source of contamination can come out from the raw material, during the process of making tofu and hygienic sanitation level during processing. Generally, this study aimed to determine the level of contamination of Escherichia coli, Staphylococcus aureus, Bacillus cereus and spore-forming bacteria in the process of making tofu and study the properties of heat resistance of eachisolate. Phases of of the study started with the isolation and identification and then quantitative analysis of Escherichiawcoli, Staphylococcus aureus, Bacillus cereus and spore-forming bacteria in the tofu process from raw materials to end product, tofu, comprised from water and soybean, slurry, soymilk cooking, curd, whey and tofu. Isolates originating from the cooking process and the coagulation process was for testing the heat resistance (D value and Z value). D and Z values were calculated using linear regression. Escherichia coli found in the water, soybeans, soybean slurry, curd and tofu, the number 10 =4,83 min and the value of Z = 22.73°C. Staphylococcus aureus found in soybeans and curd, showed the number of 101-102 CFU/g. Escherichia coli GMP isolate had D60°C CFU/g. The Staphylococcus aureus GMP4 isolate, had D60°C 1=2.72 min and the value of Z = 18.87°C. The Staphylococcus aureus GMP 6 isolate, had D=2.54min and the value of Z = 18.18°C. Bacillus cereus found in the water, soybean, soybean slurry, soymilk cooking, curdand tofu, showed the number 102-103CFU/g. Bacillus cereus vegetative cells SK 2 had D=5.43 min and the value of Z = 22.72°C. Bacillus cereus vegetative cells SK 4 had D60°C 60°C =5.95 min and the value of Z = 22.22°C. Spore-forming bacteria found in water, soybean, soybean slurry from the grinding process, the process cooking of soymilk, the process of clotting, whey and tofu, showed the number of 102CFU/g.Keywords: Tofu, Escherichia coli, Staphylococcue aureus, Bacillus cereus, a spore forming bacteria, heat resistance 60°C ABSTRAKKarakteristik tahu dengan a0,89-0,90 dan kadar protein 8% atau lebih, menjadikan tahu sebagai media yang cocok bagipertumbuhan bakteri. Hal ini menyebabkan tahu menjadi sangat mudah rusak karena cemaran bakteri. Penelitian ini bertujuan untuk mengetahui tingkat cemaran Escherichia coli, Staphylococcus aureus, Bacillus cereus dan Bakteri pembentuk spora pada proses pembuatan tahu dan mempelajari sifat ketahanan panas dari masing-masing cemaran. Tahapan penelitian dimulai dari pengamatan proses pembuatan tahu, isolasi dan identifikasi dan analisa kuantitatif cemaran Escherichia coli, Staphylococcus aureus, Bacillus cereus dan bakteri pembentuk spora pada proses pembuatantahu. Isolat yang berasal dari proses pemasakan dan proses penggumpalan digunakan untuk pengujian ketahanan panasdengan melihat nilai D dan Z menggunakan regresi linier. Escherichia coli ditemukan pada air, kedelai, bubur kedelai, gumpalan tahu dan tahu, dengan jumlah 10w1-10CFU/g. Isolat Escherichia coli dari proses penggumpalan (GMP), nilaiD60°C 2=4,83 menit dan nilai Z=22,73°C. Staphylococcus aureus ditemukan pada kedelai, gumpalan tahu dan tahu, dengan jumlah 10=2,72 menit dan nilai Z =18,87°C. Untuk isolat Staphylococcus aureus GMP 6, nilai D1CFU/g. Isolat Staphylococcus aureus GMP 4, memiliki nilai D60°C60°C =2,54 menit dan nilai Z =18,18°C. Bacillus cereus ditemukan pada air,kedelai, bubur kedelai, sari kedelai masak, gumpalan tahu dan tahu, dengan jumlah 102-10CFU/g. Sel vegetatif Bacilluscereus yang berasal dari sari kedelai (SK) 2, memiliki nilai D60°C3=5,43 menit dan nilai Z =22,72°C. Untuk sel vegetatif Bacillus cereus SK 4, memiliki nilai D60°C=5,95 menit dan nilai Z =22,22°C. Bakteri pembentuk spora ditemukan pada air, kedelai, bubur kedelai pada proses penggilingan, sari kedelai masak, gumpalan tahu, kecutan dan tahu, dengan jumlah 10CFU/g.Kata kunci: Tahu, Escherichia coli, Staphylococcue aureus, Bacillus cereus, bakteri pembentuk spora, ketahananpanas2
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Sepriana, Citra, and Eti Sumiati. "Identifikasi Dan Uji Daya Hambat Isolat Bakteri Endofit Bunga Tanaman Cengkeh (Syzygium aromaticum L.) Terhadap Bakteri Patogen." Jurnal Penelitian Pendidikan IPA 6, no. 1 (January 29, 2020): 101. http://dx.doi.org/10.29303/jppipa.v6i1.340.
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This research was conducted to find out the capabilities of endophytic bacteria isolated from flowers of the clove plants in inhibiting the growth of bacteria Streptococcus mutans, Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli and to identify endophytic bacteria that potensial to produce an antibacterial. Stages of this research include the isolation of endophytic bacteria from flowers of the clove plants, antibacterial test, and molecular identification based on 16S rRNA. Isolates of endophytic bacterial of clove plants flower produce 5 isolates, 4 isolate inhibited the bacteria S. aureus. Based on 16S rRNA molecular identification, endophytic bacterial isolates of clove plants flower which have inhibitory closely related to Bacillus amyloliquefasiens, Staphylococcus epidermidis 1034 MPA and Bacillus cereus JL.
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Sukmawati, Ika Kurnia, Ari Yuniarto, Widhya Alighita, and Ade Zam-zam J. "Antibacterial Activity of Extract and Fraction From Shitake Mushroom (Lentinula edodes) Against Acne Bacteria." Indonesian Journal of Pharmaceutical Science and Technology 6, no. 1 (October 29, 2018): 36. http://dx.doi.org/10.24198/ijpst.v6i1.14732.
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Acne is an inflammatory disease that occurs in the skin triggered by the bacteria acne treatment can be done by using natural materials that shiitake mushrooms (Lentinus edodes). This aims of this study were to determining the antibacterial activity of extracts and fractions shiitake mushrooms with broth microdilution method, determining the value of equality shiitake mushrooms with antibacterial comparison and determining the morphological changes of bacteria after exposure to the test sample with a Scanning Electron Microscope (SEM). Tests conducted antibacterial activity against Propionibacterium acnes, Staphylococcus epidermidis and Staphylococcus aureus at concentrations used is 1 ppm, 2 ppm, 4 ppm, 8 ppm, 16 ppm, 32 ppm, 64 ppm, 128 ppm, 256 ppm, 512 ppm. Best MIC value obtained in fraction of ethyl acetate and n-hexane fraction of the bacterium Propionibacterium acnes, Staphylococcus epidermidis and Staphylococcus aureus at a concentration of 256 ppm. KBM value of the n-hexane fraction against Staphylococus aureus bacteria at concentrations of 512 ppm and ethyl acetate fraction against bacteria Staphylococus aureus and epidermidis at a concentration of 512 ppm. Value equality is obtained 1 mg of ethyl acetate fraction of shiitake mushrooms equivalent to 5.346 x 10-2 mg of tetracycline. SEM test results showed the presence of antibacterial activity which is indicated by a change in cell morphology, their lumps and their cell wall frown on Propionibacterium acnes were exposed to ethyl acetate fraction.Key words: Acne, Lentinus edodes, antibacterials, microdilution, SEM
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Fofied, Suzana Kristy Satriani, Agus Sabdono, and Diah Permata Wijayanti. "Potential Bacterial Symbion of Sea Urchin As a Multi-Drug Resistant (MDR) Antibacterial Agent Against Staphylococcus aureus and Escherichia Coli Bacteria." ILMU KELAUTAN: Indonesian Journal of Marine Sciences 23, no. 3 (September 6, 2018): 131. http://dx.doi.org/10.14710/ik.ijms.23.3.131-136.
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Staphylococcus aureus and Escherichia coli are pathogenic bacteria agent of many human diseases. Those bacteria infect in various levels and also been antibiotic resistants. Bacterial resistance has become a serious global problem. The purposes of this study were to isolate and identify the symbiotic bacteria of the Sea Urchin that have an antibacterial activity of the Strain Multi-Drug Resistant (MDR) against Staphylococcus aureus and Escherichia coli. Sea Urchin was taken from Panjang island, Jepara Indonesia at 2-3 m depth. The symbiotic bacteria were isolated from Sea Urchin by using dilution method and spread plate method. Phenotypic characteristics was observed on colony shape, color and texture of growing bacteria. While the streak method was used to purify bacterial symbion. The antibacterial activity test was performed using overlay method. The results showed that 3 out of 37 isolates have antibacterial activity against Staphylococcus aureus and Escherichia coli. The BB.03.35 isolate was selected for molecular identification due to the largest inhibitory zone diameter. The sequence of this bacterium showed 97% homology and closely related to Pseudoalteromonas flavipulchra.
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Basnet, Rabina, Sudarshan Sharma, Jid Chani Rana, and Pradeep Kumar Shah. "Bacteriological Study of Otitis Media and Its Antibiotic Susceptibility Pattern." Journal of Nepal Health Research Council 15, no. 2 (September 15, 2017): 124–29. http://dx.doi.org/10.3126/jnhrc.v15i2.18186.
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Background: Otitis Media is a prevailing and notorious infection in developing countries causing serious local damage and threating complication. Mainly in developing countries like Nepal, Otitis Media results because of illiteracy, poverty and poor hygiene. The aim of this study was to determine the profile of Otitis Media, its causative agents and their antibiotic susceptibility pattern.Methods: The study included 263 pus samples from 240 patients attending ENT department of Bharatpur hospital from May 2015 to January 2016. Samples were processed in microbiology department for bacteria using standard operating protocol. Antibiotic susceptibility testing was performed for all bacterial isolates by Kirby Bauer disc diffusion method and the results were interpreted according to clinical and laboratory standard institute (CLSI) guideline.Results: Out of 240 patients, 121 were female and 119 were male. Highest incidence of Otitis Media was observed in 1-10 year age group. Out of 263 samples taken from 240 patients, 216 showed bacterial growth. Gram negative bacteria predominated and the most common bacteria isolated were Staphylococcus aureus 36.11% followed by Pseudomonas aeruginosa 33.33% and Coagulase Negative Staphylococci 8.08%. All bacterial isolates were sensitive to gentamycin. Staphylococcus aureus was sensitive to Amikacin and gentamycin. All gram negative bacterial isolates were sensitive to Imipenem and gentamycin. 100% of Pseudomonas aeruginosa was sensitive to Imipenem.Conclusions: Staphylococcus aureus was the most predominant organism isolated from the pus swab followed by Pseudomonas aeruginosa and all the isolated organisms were sensitive to Gentamycin.
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Balibar, Carl J., Xiaoyu Shen, and Jianshi Tao. "The Mevalonate Pathway of Staphylococcus aureus." Journal of Bacteriology 191, no. 3 (November 21, 2008): 851–61. http://dx.doi.org/10.1128/jb.01357-08.
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ABSTRACT Isoprenoids are a class of ubiquitous organic molecules synthesized from the five-carbon starter unit isopentenyl pyrophosphate (IPP). Comprising more than 30,000 known natural products, isoprenoids serve various important biological functions in many organisms. In bacteria, undecaprenyl pyrophosphate is absolutely required for the formation of cell wall peptidoglycan and other cell surface structures, while ubiquinones and menaquinones, both containing an essential prenyl moiety, are key electron carriers in respiratory energy generation. There is scant knowledge on the nature and regulation of bacterial isoprenoid pathways. In order to explore the cellular responses to perturbations in the mevalonate pathway, responsible for producing the isoprenoid precursor IPP in many gram-positive bacteria and eukaryotes, we constructed three strains of Staphylococcus aureus in which each of the mevalonate pathway genes is regulated by an IPTG (isopropyl-β-d-thiogalactopyranoside)-inducible promoter. We used DNA microarrays to profile the transcriptional effects of downregulating the components of the mevalonate pathway in S. aureus and demonstrate that decreased expression of the mevalonate pathway leads to widespread downregulation of primary metabolism genes, an upregulation in virulence factors and cell wall biosynthetic determinants, and surprisingly little compensatory expression in other isoprenoid biosynthetic genes. We subsequently correlate these transcriptional changes with downstream metabolic consequences.
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Wu, Julie A., Caroline Kusuma, James J. Mond, and John F. Kokai-Kun. "Lysostaphin Disrupts Staphylococcus aureus and Staphylococcus epidermidis Biofilms on Artificial Surfaces." Antimicrobial Agents and Chemotherapy 47, no. 11 (November 2003): 3407–14. http://dx.doi.org/10.1128/aac.47.11.3407-3414.2003.
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ABSTRACT Staphylococci often form biofilms, sessile communities of microcolonies encased in an extracellular matrix that adhere to biomedical implants or damaged tissue. Infections associated with biofilms are difficult to treat, and it is estimated that sessile bacteria in biofilms are 1,000 to 1,500 times more resistant to antibiotics than their planktonic counterparts. This antibiotic resistance of biofilms often leads to the failure of conventional antibiotic therapy and necessitates the removal of infected devices. Lysostaphin is a glycylglycine endopeptidase which specifically cleaves the pentaglycine cross bridges found in the staphylococcal peptidoglycan. Lysostaphin kills Staphylococcus aureus within minutes (MIC at which 90% of the strains are inhibited [MIC90], 0.001 to 0.064 μg/ml) and is also effective against Staphylococcus epidermidis at higher concentrations (MIC90, 12.5 to 64 μg/ml). The activity of lysostaphin against staphylococci present in biofilms compared to those of other antibiotics was, however, never explored. Surprisingly, lysostaphin not only killed S. aureus in biofilms but also disrupted the extracellular matrix of S. aureus biofilms in vitro on plastic and glass surfaces at concentrations as low as 1 μg/ml. Scanning electron microscopy confirmed that lysostaphin eradicated both the sessile cells and the extracellular matrix of the biofilm. This disruption of S. aureus biofilms was specific for lysostaphin-sensitive S. aureus, as biofilms of lysostaphin-resistant S. aureus were not affected. High concentrations of oxacillin (400 μg/ml), vancomycin (800 μg/ml), and clindamycin (800 μg/ml) had no effect on the established S. aureus biofilms in this system, even after 24 h. Higher concentrations of lysostaphin also disrupted S. epidermidis biofilms.
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Rasooly, Reuven, Hwang-Yong Choi, Paula Do, Gianluca Morroni, Lucia Brescini, Oscar Cirioni, Andrea Giacometti, and Emmanouil Apostolidis. "whISOBAXTM Inhibits Bacterial Pathogenesis and Enhances the Effect of Antibiotics." Antibiotics 9, no. 5 (May 19, 2020): 264. http://dx.doi.org/10.3390/antibiotics9050264.
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As bacteria are becoming more resistant to commonly used antibiotics, alternative therapies are being sought. whISOBAX (WH) is a witch hazel extract that is highly stable (tested up to 2 months in 37 °C) and contains a high phenolic content, where 75% of it is hamamelitannin and traces of gallic acid. Phenolic compounds like gallic acid are known to inhibit bacterial growth, while hamamelitannin is known to inhibit staphylococcal pathogenesis (biofilm formation and toxin production). WH was tested in vitro for its antibacterial activity against clinically relevant Gram-positive and Gram-negative bacteria, and its synergy with antibiotics determined using checkerboard assays followed by isobologram analysis. WH was also tested for its ability to suppress staphylococcal pathogenesis, which is the cause of a myriad of resistant infections. Here we show that WH inhibits the growth of all bacteria tested, with variable efficacy levels. The most WH-sensitive bacteria tested were Staphylococcus epidermidis, Staphylococcus aureus, Enterococcus faecium and Enterococcus faecalis, followed by Acinetobacter baumannii, Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Streptococcus agalactiae and Streptococcus pneumoniae. Furthermore, WH was shown on S. aureus to be synergistic to linezolid and chloramphenicol and cumulative to vancomycin and amikacin. The effect of WH was tested on staphylococcal pathogenesis and shown here to inhibit biofilm formation (tested on S. epidermidis) and toxin production (tested on S. aureus Enterotoxin A (SEA)). Toxin inhibition was also evident in the presence of subinhibitory concentrations of ciprofloxacin that induces pathogenesis. Put together, our study indicates that WH is very effective in inhibiting the growth of multiple types of bacteria, is synergistic to antibiotics, and is also effective against staphylococcal pathogenesis, often the cause of persistent infections. Our study thus suggests the benefits of using WH to combat various types of bacterial infections, especially those that involve resistant persistent bacterial pathogens.
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Newstead, Logan L., Katarina Varjonen, Tim Nuttall, and Gavin K. Paterson. "Staphylococcal-Produced Bacteriocins and Antimicrobial Peptides: Their Potential as Alternative Treatments for Staphylococcus aureus Infections." Antibiotics 9, no. 2 (January 21, 2020): 40. http://dx.doi.org/10.3390/antibiotics9020040.
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Staphylococcus aureus is an important pathogen of both humans and animals, implicated in a wide range of infections. The emergence of antibiotic resistance has resulted in S. aureus strains that are resistant to almost all available antibiotics, making treatment a clinical challenge. Development of novel antimicrobial approaches is now a priority worldwide. Bacteria produce a range of antimicrobial peptides; the most diverse of these being bacteriocins. Bacteriocins are ribosomally synthesised peptides, displaying potent antimicrobial activity usually against bacteria phylogenetically related to the producer strain. Several bacteriocins have been isolated from commensal coagulase-negative staphylococci, many of which display inhibitory activity against S. aureus in vitro and in vivo. The ability of these bacteriocins to target biofilm formation and their novel mechanisms of action with efficacy against antibiotic-resistant bacteria make them strong candidates as novel therapeutic antimicrobials. The use of genome-mining tools will help to advance identification and classification of bacteriocins. This review discusses the staphylococcal-derived antimicrobial peptides displaying promise as novel treatments for S. aureus infections.
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Brzezińska-Blaszczyk, E., and M. Wasiela. "Vaginal Bacterial Flora Activates Rat Peritoneal Mast Cells." International Journal of Immunopathology and Pharmacology 15, no. 3 (September 2002): 233–38. http://dx.doi.org/10.1177/039463200201500310.
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Sixteen strains of physiological and pathological vaginal bacteria were tested for their ability to secrete histamine from rat peritoneal mast cells in vitro. We noticed that Mycoplasma hominis -induced histamine release was very high (up to 53.6%). The stimulation of rat mast cells with Staphylococccus cohnii, Staphylococcus coagulase(-) (two strains), Ureaplasma urealyticum, Peptostreptococcus spp., Bacteroides capillosus, Staphylococcus aureus and Streptococcus agalactiae resulted in lower, but significant histamine secretion (11.2%–17.5%). Other bacterial strains ( Staphylococcus epidermidids, Enterococcus faecalis, Escherichia coli, Actinomyces naeslundii (two strains) and Lactobacillus fermentum (two strains) caused very low (4.2 % – 8.8%) histamine release.