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Journal articles on the topic 'Streptococcies'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Vogel, Verena, and Barbara Spellerberg. "Bacteriocin Production by Beta-Hemolytic Streptococci." Pathogens 10, no. 7 (2021): 867. http://dx.doi.org/10.3390/pathogens10070867.

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Beta-hemolytic streptococci cause a variety of infectious diseases associated with high morbidity and mortality. A key factor for successful infection is host colonization, which can be difficult in a multispecies environment. Secreting bacteriocins can be beneficial during this process. Bacteriocins are small, ribosomally produced, antimicrobial peptides produced by bacteria to inhibit the growth of other, typically closely related, bacteria. In this systematic review, bacteriocin production and regulation of beta-hemolytic streptococci was surveyed. While Streptococcus pyogenes produces eigh

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2

W S Harty, Derek. "Virulence factors in streptococcal infective endocarditis." Microbiology Australia 26, no. 3 (2005): 114. http://dx.doi.org/10.1071/ma05114.

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Infective endocarditis (IE) is a life threatening, endovascular infection occurring when bacteria enter the blood stream and adhere to heart valves. Mortality rates remain in the range of 11-27%. The most common infecting micro-organisms are now the staphylococci (44%) although streptococci (31%) and particularly the oral streptococci (21%) are still major causative agents. Many different oral streptococci have been isolated from IE cases, the most common being Streptococcus sanguinis, Streptococcus oralis, Streptococcus gordonii, Streptococcus mitis, Streptococcus anginosus group and mutans s

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3

Rasool, Sheikh Ajaz, Samia Ahmed, and Alfred Iqbal. "Streptococcins of Indigenous Hemolytic Streptococci." Natural Product Letters 8, no. 1 (1996): 67–74. http://dx.doi.org/10.1080/10575639608043241.

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4

Vance, D. W. "Group C Streptococci: "Streptococcus equisimilis" or Streptococcus anginosus?" Clinical Infectious Diseases 14, no. 2 (1992): 616. http://dx.doi.org/10.1093/clinids/14.2.616.

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5

Brown, Alan E., Jeffrey D. Rogers, Elaine M. Haase, Peter M. Zelasko, and Frank A. Scannapieco. "Prevalence of the Amylase-Binding Protein A Gene (abpA) in Oral Streptococci." Journal of Clinical Microbiology 37, no. 12 (1999): 4081–85. http://dx.doi.org/10.1128/jcm.37.12.4081-4085.1999.

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Salivary amylase binds specifically to a number of oral streptococcal species. This interaction may play an important role in dental plaque formation. Recently, a 585-bp gene was cloned and sequenced from Streptococcus gordonii Challis encoding a 20.5-kDa amylase-binding protein (AbpA). The goal of this study was to determine if related genes are present in other species of oral streptococci. Biotinylated abpA was used in Southern blot analysis to screen genomic DNA from several strains representing eight species of oral streptococci. This probe hybridized with a 4.0-kbHindIII restriction frag

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6

Woo, Patrick CY, Jade LL Teng, Kit-wah Leung, et al. "Streptococcus sinensis may react with Lancefield group F antiserum." Journal of Medical Microbiology 53, no. 11 (2004): 1083–88. http://dx.doi.org/10.1099/jmm.0.45745-0.

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Lancefield group F streptococci have been found almost exclusively as members of the ‘Streptococcus milleri’ group, although they have been reported very occasionally in some other streptococcal species. Among 302 patients with bacteraemia caused by viridans streptococci over a 6-year period, three cases were caused by Streptococcus sinensis (type strain HKU4T, HKU5 and HKU6). All three patients had infective endocarditis complicating their underlying chronic rheumatic heart diseases. Gene sequencing showed no base differences between the 16S rRNA gene sequences of HKU5 and HKU6 and that of HK

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7

Verrall, Rosemary. "The Streptococcus milleri Group." Infection Control 7, no. 11 (1986): 558–60. http://dx.doi.org/10.1017/s0195941700065334.

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Microbiologists traditionally have relied on biochemical and serologic tests to identify only group A, group B, and group D streptococci isolated from patients with serious infections. Until recently there has been little interest in the further classification of other streptococci isolated from clinical specimens.In 1956, Guthof repeatedly isolated a particular streptococcus from dental abscesses and named the organism Streptococcus milleri in honor of the microbiologist, W.D. Miller. In 1976, Parker and Ball associated this microorganism with other pyogenic infections and later described the

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8

Facklam, Richard. "What Happened to the Streptococci: Overview of Taxonomic and Nomenclature Changes." Clinical Microbiology Reviews 15, no. 4 (2002): 613–30. http://dx.doi.org/10.1128/cmr.15.4.613-630.2002.

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SUMMARY Since the division of the Streptococcus genus into enterococci, lactococci, and streptococci in 1984, many changes in the nomenclature and taxonomy of the Streptococcus genus have taken place. The application of genetic comparisons has improved the proper classification of the different species. The Lancefield system of serogrouping the streptococci by the expression of beta-hemolysis on blood agar plates is still very useful for the identification of streptococci for patient management. The Lancefield grouping system cannot be used in itself for accurate identification of specific bet

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9

Loimaranta, V., N. S. Jakubovics, J. Hytönen, J. Finne, H. F. Jenkinson, and N. Strömberg. "Fluid- or Surface-Phase Human Salivary Scavenger Protein gp340 Exposes Different Bacterial Recognition Properties." Infection and Immunity 73, no. 4 (2005): 2245–52. http://dx.doi.org/10.1128/iai.73.4.2245-2252.2005.

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ABSTRACT Salivary scavenger receptor cysteine-rich protein gp340 aggregates streptococci and other bacteria as part of the host innate defense system at mucosal surfaces. In this article, we have investigated the properties of fluid-phase gp340 and hydroxylapatite surface-adsorbed gp340 in aggregation and adherence, respectively, of viridans group streptococci (e.g., Streptococcus gordonii and Streptococcus mutans), non-viridans group streptococci (e.g., Streptococcus pyogenes and Streptococcus suis), and oral Actinomyces. Fluid-phase gp340 and surface-phase gp340 bioforms were differentially

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10

Grönroos, L., M. Saarela, J. Mättö, U. Tanner-Salo, A. Vuorela, and S. Alaluusua. "Mutacin Production by Streptococcus mutans May Promote Transmission of Bacteria from Mother to Child." Infection and Immunity 66, no. 6 (1998): 2595–600. http://dx.doi.org/10.1128/iai.66.6.2595-2600.1998.

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ABSTRACT The production of bacteriocin-like inhibitory substances, mutacins, by mutans streptococci varies among isolates. To find if the degree of mutacin activity of an isolate was related to its transmission between mother and her child, 19 mothers and their 18-month- to 3-year-old children were sampled for their oral mutans streptococci. In addition, the stability of mutacin activity was studied with isolates from the mothers and with isolates from five unrelated 5-year-old children in 5- to 7-year follow-up studies. A total of 145 oral mutans streptococcal isolates were serotyped by immun

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11

Stanojkovic, Aleksandar, Ruzica Asanin, Jelena Asanin, Ksenija Palic, Aleksandra Stanojkovic та Jadranka Zutic. "Investigation of presence of α haemolytic streptococci, enterococci and streptococci-like bacteria in different materials originating from pigs". Veterinarski glasnik 65, № 3-4 (2011): 203–13. http://dx.doi.org/10.2298/vetgl1104203s.

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The aim of this investigation was to establish the presence and prevalence of streptococci, enterococci and streptococci-like bacteria in various materials originating from healthy, slaughtered and dead pigs belonging to different categories from several farms and slaughterhouses in the Republic of Serbia. The total number of investigated samples comprised 226 swabs of tonsils and noses from clinically healthy breeders, swabs of tonsils from piglets 5-20 days old, parts of nasopharyngeal tonsils from breeders slaughtered in a slaughterhouse, parts of nasopharyngeal tonsils from piglets slaught

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12

Ruoff, Kathryn L. "Update on nutritionally variant streptococci (Streptococcus defectives and Streptococcus adjacents)." Clinical Microbiology Newsletter 12, no. 13 (1990): 97–99. http://dx.doi.org/10.1016/0196-4399(90)90056-h.

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13

Erol, Erdal, Stephan J. Locke, Judy K. Donahoe, Mary A. Mackin, and Craig N. Carter. "Beta-hemolytic Streptococcus spp. from horses." Journal of Veterinary Diagnostic Investigation 24, no. 1 (2012): 142–47. http://dx.doi.org/10.1177/1040638711434138.

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The goal of this retrospective study was to have a comprehensive picture of the β-hemolytic streptococci of horses including tissue/organ distributions and susceptibility patterns against specific antimicrobials between January 1, 2000 and December 31, 2010. A total of 2,497 β-hemolytic streptococci were isolated from 2,391 cases, of which Streptococcus equi subsp. zooepidemicus was the most frequent isolate (72.0%). Other species isolated were Streptococcus dysgalactia subsp. equisimilis (21.3%), Streptococcus equi subsp. equi (5.8%), and unidentified β-hemolytic streptococci (0.9%). As expec

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14

Al-Ahmad, Ali, Thorsten Mathias Auschill, Gabriele Braun, Elmar Hellwig, and Nicole Birgit Arweiler. "Overestimation of Streptococcus mutans prevalence by nested PCR detection of the 16S rRNA gene." Journal of Medical Microbiology 55, no. 1 (2006): 109–13. http://dx.doi.org/10.1099/jmm.0.46280-0.

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This study was carried out in order to compare two PCR-based methods in the detection of Streptococcus mutans. The first PCR method was based on primers for the 16S rRNA gene and the second method was based on specific primers that targeted the glucosyltransferase gene (gtfB). Each PCR was performed with eight different streptococci from the viridans group, five other streptococci and 17 different non-streptococcal bacterial strains. Direct use of the S. mutans 16S rRNA gene-specific primers revealed that Streptococcus gordonii and Streptococcus infantis were also detected. After amplifying th

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15

Chalmers, Natalia I., Robert J. Palmer, John O. Cisar, and Paul E. Kolenbrander. "Characterization of a Streptococcus sp.-Veillonella sp. Community Micromanipulated from Dental Plaque." Journal of Bacteriology 190, no. 24 (2008): 8145–54. http://dx.doi.org/10.1128/jb.00983-08.

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ABSTRACT Streptococci and veillonellae occur in mixed-species colonies during formation of early dental plaque. One factor hypothesized to be important in assembly of these initial communities is coaggregation (cell-cell recognition by genetically distinct bacteria). Intrageneric coaggregation of streptococci occurs when a lectin-like adhesin on one streptococcal species recognizes a receptor polysaccharide (RPS) on the partner species. Veillonellae also coaggregate with streptococci. These genera interact metabolically; lactic acid produced by streptococci is a carbon source for veillonellae.

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16

Sader, Helio S., Robert K. Flamm, David J. Farrell, and Ronald N. Jones. "Daptomycin Activity against Uncommonly Isolated Streptococcal and Other Gram-Positive Species Groups." Antimicrobial Agents and Chemotherapy 57, no. 12 (2013): 6378–80. http://dx.doi.org/10.1128/aac.01906-13.

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ABSTRACTA total of 1,356 clinical isolates were tested against daptomycin by broth microdilution methods. Daptomycin was active against seven groups of viridans group streptococci (MIC50and MIC90values ranging from ≤0.06 and ≤0.06 μg/ml [Streptococcus bovisandStreptococcus dysgalactiae] to 0.5 and 1 μg/ml [Streptococcus mitis,Streptococcus oralis, andStreptococcus parasanguinis], respectively), beta-hemolytic streptococci serogroups C, F, and G (MIC50and MIC90, ≤0.06 to 0.25 and 0.12 to 0.25 μg/ml, respectively),Corynebacteriumspp. (MIC50and MIC90, ≤0.06 and 0.12 μg/ml, respectively), andMicro

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17

Mayanskiy, N. A., A. Z. Kvarchiya, E. A. Brzhozovskaya, O. A. Ponomarenko, O. A. Kryzhanovskaya, and Tatyana V. Kulichenko. "SPECIES DIVERSITY AND SENSITIVITY TO ANTIBIOTICS AGAINST ORAL STREPTOCOCCI ISOLATED IN CHILDREN." Russian Pediatric Journal 22, no. 3 (2019): 153–61. http://dx.doi.org/10.18821/1560-9561-2019-22-3-153-161.

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Oral streptococci can exchange genetic material with other bacteria colonizing the same loci of the body, their resistance profiles can serve as markers of the risk of the developing resistance to certain antibiotics in closely related bacteria, in particular, Streptococcus pneumoniae. Materials and Methods To describe the species composition of oral streptococci and to detect the profile of their sensitivity to a wide range of antibiotics there were investigated oral streptococcal isolates isolated from oropharyngeal smears sown in children of various ages with acute respiratory infections no

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18

Park, Hee Kuk, Sang-Jae Lee, Jang Won Yoon, et al. "Identification of the cpsA gene as a specific marker for the discrimination of Streptococcus pneumoniae from viridans group streptococci." Journal of Medical Microbiology 59, no. 10 (2010): 1146–52. http://dx.doi.org/10.1099/jmm.0.017798-0.

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Streptococcus pneumoniae, the aetiological agent of pneumonia and non-gonococcal urethritis, shares a high degree of DNA sequence identity with the viridans group of streptococci, particularly Streptococcus mitis and Streptococcus oralis. Although their clinical and pathological manifestations are different, discrimination between S. pneumoniae and its close viridans cocci relatives is still quite difficult. Suppression subtractive hybridization was performed to identify the genomic differences between S. pneumoniae and S. mitis. Thirty-four resulting S. pneumoniae-specific clones were examine

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19

Sadowy, Ewa, and Waleria Hryniewicz. "Identification of Streptococcus pneumoniae and other Mitis streptococci: importance of molecular methods." European Journal of Clinical Microbiology & Infectious Diseases 39, no. 12 (2020): 2247–56. http://dx.doi.org/10.1007/s10096-020-03991-9.

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AbstractThe Mitis group of streptococci includes an important human pathogen, Streptococcus pneumoniae (pneumococcus) and about 20 other related species with much lower pathogenicity. In clinical practice, some representatives of these species, especially Streptococcus pseudopneumoniae and Streptococcus mitis, are sometimes mistaken for S. pneumoniae based on the results of classical microbiological methods, such as optochin susceptibility and bile solubility. Several various molecular approaches that address the issue of correct identification of pneumococci and other Mitis streptococci have

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20

SITKIEWICZ, IZABELA, and WALERIA HRYNIEWICZ. "Pyogenic Streptococci – Danger of Re-Emerging Pathogens." Polish Journal of Microbiology 59, no. 4 (2010): 219–26. http://dx.doi.org/10.33073/pjm-2010-034.

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Beta-hemolytic, pyogenic streptococci are classified according to type of major surface antigen into A (Streptococcus pyogenes), B (Streptococcus agalactiae), C (multiple species including Streptococcus dysagalactiae) and G (multiple species including Streptococcus canis) Lancefield groups. Group A Streptococcus causes each year hundreds of thousands deaths globally as a result of infections and post-infectional sequelae. An increasing number of severe, invasive infections is caused by selected, specialized pathogenic clones. Within the last 50 years, an increasing number of human infections c

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21

Igarashi, Takeshi, Ayako Yamamoto, and Nobuichi Goto. "Polymerase chain reaction for identification of oral streptococci: Streptococcus mutans, Streptococcus sobrinus, Streptococcus downei and Streptococcus salivarius." Journal of Microbiological Methods 34, no. 1 (1998): 81–88. http://dx.doi.org/10.1016/s0167-7012(98)00078-5.

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22

Sheng, Jiangyun, Jeremiah D. Baldeck, Phuong T. M. Nguyen, Robert G. Quivey, and Robert E. Marquis. "Alkali production associated with malolactic fermentation by oral streptococci and protection against acid, oxidative, or starvation damage." Canadian Journal of Microbiology 56, no. 7 (2010): 539–47. http://dx.doi.org/10.1139/w10-039.

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Alkali production by oral streptococci is considered important for dental plaque ecology and caries moderation. Recently, malolactic fermentation (MLF) was identified as a major system for alkali production by oral streptococci, including Streptococcus mutans . Our major objectives in the work described in this paper were to further define the physiology and genetics of MLF of oral streptococci and its roles in protection against metabolic stress damage. l-Malic acid was rapidly fermented to l-lactic acid and CO2by induced cells of wild-type S. mutans, but not by deletion mutants for mleS (mal

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23

Nygren, David, Bo Nilson, and Magnus Rasmussen. "A Case of Recurrent Erysipelas Caused by Streptococcus mitis Group." Case Reports in Infectious Diseases 2018 (May 30, 2018): 1–4. http://dx.doi.org/10.1155/2018/5156085.

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The aetiology of erysipelas remains poorly defined though beta-haemolytic streptococci are considered as the main causative pathogens. We describe a case of a 70-year-old woman with recurrent erysipelas in her left arm due to infection with streptococci of the mitis group. Her past medical history includes lymphoedema of the left arm secondary to lymph node dissection due to breast cancer surgery. On seven different occasions during a decade, she has presented a clinical picture of erysipelas and in three of them with Streptococcus mitis group bacteraemia. The results indicate that two cases w

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24

Ruoff, K. L. "Streptococcus anginosus ("Streptococcus milleri"): the unrecognized pathogen." Clinical Microbiology Reviews 1, no. 1 (1988): 102–8. http://dx.doi.org/10.1128/cmr.1.1.102.

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"Streptococcus milleri" is an unofficial name that has been applied to a group of streptococci which, although basically similar, show various hemolytic, serological, and physiological characteristics. The species name Streptococcus anginosus has recently been recognized as the approved name for these organisms. Streptococci known as "S. milleri" have been implicated as etiologic agents in a variety of serious purulent infections, but because of their heterogeneous characteristics, these organisms may be unrecognized or misidentified by clinical laboratorians. This review describes the bacteri

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Madineni, Praveen Kumar, Suresh Babu Ghanta, Naveen Kumar Motupalli, Mahanthesh Bembalgi, and P. Krishnam Raju. "Comparative Analysis of Colony Counts of Different Species of Oral Streptococci in Saliva of Dentulous, Edentulous and in those Wearing Partial and Complete Dentures." Journal of Contemporary Dental Practice 14, no. 4 (2013): 601–4. http://dx.doi.org/10.5005/jp-journals-10024-1371.

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ABSTRACT Objectives To study and compare the number of colony forming units of Streptococcus mutans, Streptococcus sanguis, Streptococcus salivarius, Streptococcus mitis and Streptococcus milleri in dentulous, edentulous and in those wearing partial and complete dentures by using semi-quantitative culture method of saliva samples with calibrated standard loop Materials Sterile specimen collection bottles, Mitis salivarius agar plates, Standard loop, Candle jar, Incubator, Colony counter Methodology Study population consisted of 100 subjects with 25 in each group, with an age range of 40 to 80

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26

Traczewski, Maria M., and Steven D. Brown. "Proposed MIC and Disk Diffusion Microbiological Cutoffs and Spectrum of Activity of Retapamulin, a Novel Topical Antimicrobial Agent." Antimicrobial Agents and Chemotherapy 52, no. 11 (2008): 3863–67. http://dx.doi.org/10.1128/aac.00399-08.

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ABSTRACT Retapamulin, the first pleuromutilin antimicrobial agent approved for the topical treatment of skin infections in humans, was tested against 987 clinical isolates representing 30 species and/or resistance groups. MICs were determined along with disk diffusion zone diameters using a 2-μg disk. Population distribution and MIC versus disk zone diameter scattergrams were analyzed to determine microbiological MIC cutoff values and inhibition zone correlates. Minimum bactericidal concentrations were performed on a smaller subset of key species. The retapamulin MIC90 against 234 Staphylococc

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27

Bernstein, Joel M., Michael Belmont, Howard S. Faden, Diane Dryja, Frank Scannapieco, and Judy Wolf. "Interference of Nontypeable Haemophilus Influenzae and Moraxella Catarrhalis by Streptococcus Oralis in Adenoid Organ Culture: A Possible Strategy for the Treatment of the Otitis-Prone Child." Annals of Otology, Rhinology & Laryngology 111, no. 8 (2002): 696–700. http://dx.doi.org/10.1177/000348940211100807.

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The role of viridans group streptococci (Streptococcus oralis) in the prevention of colonization with nontypeable Haemophilus influenzae and Moraxella catarrhalis was investigated in an adenoid organ culture system. The adenoids from 100 patients who were undergoing adenoidectomy for either hypertrophy or recurrent otitis media were used. Streptococcus oralis Parker uniformly inhibited colonization with nontypeable H influenzae or M catarrhalis over a 24-hour period of incubation in adenoid organ culture. Streptococcus oralis Booth, a noninhibitory strain, did not significantly reduce coloniza

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28

Bouvet, A. "Human endocarditis due to nutritionally variant streptococci: Streptococcus adjacens and Streptococcus defectivus." European Heart Journal 16, suppl B (1995): 24–27. http://dx.doi.org/10.1093/eurheartj/16.suppl_b.24.

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Takada, Kazuko, and Masatomo Hirasawa. "Streptococcus orisuis sp. nov., isolated from the pig oral cavity." International Journal of Systematic and Evolutionary Microbiology 57, no. 6 (2007): 1272–75. http://dx.doi.org/10.1099/ijs.0.64741-0.

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Five bacterial strains, designated as NUM 1001T, NUM 1002, NUM 1003, NUM 1004 and NUM 1005, were isolated from the oral cavities of pigs. Colonies grown on mitis salivarius agar were similar in morphology to those of mutans streptococci. The novel isolates were analysed biochemically using the Rapid ID 32 Strep microsystem, subjected to DNA–DNA hybridization with oral streptococci and had their 16S rRNA genes sequenced. On the basis of the phylogenetic and phenotypic evidence obtained, the strains represent a novel species of the genus Streptococcus, for which the name Streptococcus orisuis sp

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30

Iannelli, Francesco, Francesco Santoro, Valeria Fox, and Gianni Pozzi. "A Mating Procedure for Genetic Transfer of Integrative and Conjugative Elements (ICEs) of Streptococci and Enterococci." Methods and Protocols 4, no. 3 (2021): 59. http://dx.doi.org/10.3390/mps4030059.

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DNA sequencing of whole bacterial genomes has revealed that the entire set of mobile genes (mobilome) represents as much as 25% of the bacterial genome. Despite the huge availability of sequence data, the functional analysis of the mobile genetic elements (MGEs) is rarely reported. Therefore, established laboratory protocols are needed to investigate the biology of this important part of the bacterial genome. Conjugation is a mechanism of horizontal gene transfer which allows the exchange of MGEs among strains of the same or different bacterial species. In streptococci and enterococci, integra

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Ardanuy, Carmen, Fe Tubau, Josefina Liñares, María Angeles Domínguez, Román Pallarés, and Rogelio Martín. "Distribution of Subclasses mefA and mefE of the mefA Gene among Clinical Isolates of Macrolide-Resistant (M-Phenotype) Streptococcus pneumoniae, Viridans Group Streptococci, and Streptococcus pyogenes." Antimicrobial Agents and Chemotherapy 49, no. 2 (2005): 827–29. http://dx.doi.org/10.1128/aac.49.2.827-829.2005.

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ABSTRACT The distribution of subclasses mefA and mefE of the mefA gene among 116 M-phenotype streptococci was as follows: pneumococci (38 strains had mefE and 4 mefA), viridans streptococci (49 mefE and 1 mefA), and Streptococcus pyogenes (24 mefA). Spain9V-3-14 and England14-9 clones of serotype 14 were dominant among pneumococci.

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Ashby, Michael T., Jens Kreth, Muthu Soundarajan, and Laure Sita Sivuilu. "Influence of a model human defensive peroxidase system on oral streptococcal antagonism." Microbiology 155, no. 11 (2009): 3691–700. http://dx.doi.org/10.1099/mic.0.031310-0.

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Streptococcus is a dominant genus in the human oral cavity, making up about 20 % of the more than 800 species of bacteria that have been identified, and about 80 % of the early biofilm colonizers. Oral streptococci include both health-compatible (e.g. Streptococcus gordonii and Streptococcus sanguinis) and pathogenic strains (e.g. the cariogenic Streptococcus mutans). Because the streptococci have similar metabolic requirements, they have developed defence strategies that lead to antagonism (also known as bacterial interference). S. mutans expresses bacteriocins that are cytotoxic toward S. go

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Hahn, Chin-Lo, Harvey A. Schenkein, and John G. Tew. "Endocarditis-Associated Oral Streptococci Promote Rapid Differentiation of Monocytes into Mature Dendritic Cells." Infection and Immunity 73, no. 8 (2005): 5015–21. http://dx.doi.org/10.1128/iai.73.8.5015-5021.2005.

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ABSTRACT Endocarditis is frequently attributable to oral streptococci, but mechanisms of pathogenesis are not well understood, although monocytes appear to be important. High titers of interleukin-12 (IL-12) are produced by peripheral blood mononuclear cells (PBMC) after engaging Streptococcus mutans, but monocytes in developing endocardial vegetations tend to disappear rather than become macrophages. These data prompted the hypothesis that streptococcus-infected monocytes differentiate into short-lived IL-12-producing dendritic cells (DCs) rather than macrophages. PBMC from healthy subjects w

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34

Leegaard, Truls M., Hester J. Bootsma, Dominique A. Caugant, et al. "Phenotypic and genomic characterization of pneumococcus-like streptococci isolated from HIV-seropositive patients." Microbiology 156, no. 3 (2010): 838–48. http://dx.doi.org/10.1099/mic.0.035345-0.

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Accurate differentiation between pneumococci and other viridans streptococci is essential given their differences in clinical significance. However, classical phenotypic tests are often inconclusive, and many examples of atypical reactions have been reported. In this study, we applied various phenotypic and genotypic methods to discriminate between a collection of 12 streptococci isolated from the upper respiratory tract of HIV-seropositive individuals in 1998 and 1999. Conventional phenotypic characterization initially classified these streptococci as Streptococcus pneumoniae, as they were al

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35

Cvitkovitch, D. G. "Genetic Competence and Transformation in Oral Streptococci." Critical Reviews in Oral Biology & Medicine 12, no. 3 (2001): 217–43. http://dx.doi.org/10.1177/10454411010120030201.

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The oral streptococci are normally non-pathogenic residents of the human microflora. There is substantial evidence that these bacteria can, however, act as "genetic reservoirs" and transfer genetic information to transient bacteria as they make their way through the mouth, the principal entry point for a wide variety of bacteria. Examples that are of particular concern include the transfer of antibiotic resistance from oral streptococci to Streptococcus pneumoniae. The mechanisms that are used by oral streptococci to exchange genetic information are not well-understood, although several specie

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ZADOKS, R. N., R. N. GONZÁLEZ, K. J. BOOR, and Y. H. SCHUKKEN. "Mastitis-Causing Streptococci Are Important Contributors to Bacterial Counts in Raw Bulk Tank Milk." Journal of Food Protection 67, no. 12 (2004): 2644–50. http://dx.doi.org/10.4315/0362-028x-67.12.2644.

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The objective of this study was to probe the contribution of streptococci to the microbial quality of raw milk. Over a 5-month period, bulk tank milk samples from 48 New York State dairy farms were analyzed qualitatively for bacterial ecology and quantitatively for total bacterial, streptococcal, staphylococcal, and gram-negative bacterial counts. Linear regression analysis was used to determine the contribution of differential counts to total bacterial counts. Streptococci, staphylococci, and gram-negative bacteria accounted for 69, 3, and 3% of total bacterial count variability, respectively

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Bassetti, Matteo, Louise M. Dembry, Patricia A. Farrel, Deborah A. Callan та Vincent T. Andriole. "Antimicrobial Activities of BMS-284756 Compared with Those of Fluoroquinolones and β-Lactams against Gram-Positive Clinical Isolates". Antimicrobial Agents and Chemotherapy 46, № 1 (2002): 234–38. http://dx.doi.org/10.1128/aac.46.1.234-238.2002.

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ABSTRACT The in vitro antibacterial activity of BMS-284756 was compared to those of ciprofloxacin, gatifloxacin, moxifloxacin, ceftriaxone, imipenem, piperacillin-tazobactam, and amoxicillin-clavulanic acid against 492 gram-positive clinical isolates. BMS-284756 was the most-active agent against Streptococcus pneumoniae, Streptococcus viridans, beta-hemolytic streptococci, methicillin-sensitive and -resistant Staphylococcus aureus, methicillin-sensitive and -resistant coagulase-negative staphylococci, and enterococci.

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Balsalobre, Luz, María José Ferrándiz, Josefina Liñares, Fe Tubau, and Adela G. de la Campa. "Viridans Group Streptococci Are Donors in Horizontal Transfer of Topoisomerase IV Genes to Streptococcus pneumoniae." Antimicrobial Agents and Chemotherapy 47, no. 7 (2003): 2072–81. http://dx.doi.org/10.1128/aac.47.7.2072-2081.2003.

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ABSTRACT A total of 46 ciprofloxacin-resistant (Cipr) Streptococcus pneumoniae strains were isolated from 1991 to 2001 at the Hospital of Bellvitge. Five of these strains showed unexpectedly high rates of nucleotide variations in the quinolone resistance-determining regions (QRDRs) of their parC, parE, and gyrA genes. The nucleotide sequence of the full-length parC, parE, and gyrA genes of one of these isolates revealed a mosaic structure compatible with an interspecific recombination origin. Southern blot analysis and nucleotide sequence determinations showed the presence of an ant-like gene

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Wu, Ren, Meixian Zhou, and Hui Wu. "Purification and Characterization of an Active N-Acetylglucosaminyltransferase Enzyme Complex from Streptococci." Applied and Environmental Microbiology 76, no. 24 (2010): 7966–71. http://dx.doi.org/10.1128/aem.01434-10.

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ABSTRACT A new family of bacterial serine-rich repeat glycoproteins can function as adhesins required for biofilm formation and pathogenesis in streptococci and staphylococci. Biogenesis of these proteins depends on a gene cluster coding for glycosyltransferases and accessory secretion proteins. Previous studies show that Fap1, a member of this family from Streptococcus parasanguinis, can be glycosylated by a protein glycosylation complex in a recombinant heterogeneous host. Here we report a tandem affinity purification (TAP) approach used to isolate and study protein complexes from native str

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Hamada, Tomoyuki, Masatsugu Kawashima, Haruo Watanabe, Junji Tagami, and Hidenobu Senpuku. "Molecular Interactions of Surface Protein Peptides of Streptococcus gordonii with Human Salivary Components." Infection and Immunity 72, no. 8 (2004): 4819–26. http://dx.doi.org/10.1128/iai.72.8.4819-4826.2004.

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ABSTRACT Oral streptococci play a large role in dental biofilm formation, and several types interact as early colonizers with the enamel salivary pellicle to form the primary biofilm, as well as to incorporate other bacteria on tooth surfaces. Interactions of surface molecules of individual streptococci with the salivary pellicle on the tooth surface have an influence on the etiological properties of an oral biofilm. To elucidate the molecular interactions of streptococci with salivary components, binding between surface protein (SspB and PAg) peptides of Streptococcus gordonii and Streptococc

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Jeric, P. E., H. Lopardo, P. Vidal, et al. "Multicenter Study on Spreading of the tet(M) Gene in Tetracycline-Resistant Streptococcus Group G and C Isolates in Argentina." Antimicrobial Agents and Chemotherapy 46, no. 1 (2002): 239–41. http://dx.doi.org/10.1128/aac.46.2.239-241.2002.

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ABSTRACT A prospective multicenter study on invasive infections caused by beta-hemolytic streptococci was performed over 6 months and involved 42 centers from 16 cities in Argentina. Among 33 isolates recovered, 9 group G Streptococcus isolates (39.1%) and 2 group C Streptococcus isolates (20%) exhibited resistance to tetracycline and harbored the tet(M) gene. Genealogical analysis revealed that tetracycline resistance has a polyclonal origin in Argentina.

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Scoffield, Jessica A., and Hui Wu. "Oral Streptococci and Nitrite-Mediated Interference of Pseudomonas aeruginosa." Infection and Immunity 83, no. 1 (2014): 101–7. http://dx.doi.org/10.1128/iai.02396-14.

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The oral cavity harbors a diverse community of microbes that are physiologically unique. Oral microbes that exist in this polymicrobial environment can be pathogenic or beneficial to the host. Numerous oral microbes contribute to the formation of dental caries and periodontitis; however, there is little understanding of the role these microbes play in systemic infections. There is mounting evidence that suggests that oral commensal streptococci are cocolonized withPseudomonas aeruginosaduring cystic fibrosis pulmonary infections and that the presence of these oral streptococci contributes to i

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Chuard, C., and L. B. Reller. "Bile-Esculin Test for Presumptive Identification of Enterococci and Streptococci: Effects of Bile Concentration, Inoculation Technique, and Incubation Time." Journal of Clinical Microbiology 36, no. 4 (1998): 1135–36. http://dx.doi.org/10.1128/jcm.36.4.1135-1136.1998.

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The bile-esculin test is used to differentiate enterococci and group D streptococci from non-group D viridans group streptococci. The effects on test performance of the concentration of bile salts, inoculum, and duration of incubation were examined with 110 strains of enterococci, 30 strains of Streptococcus bovis, and 110 strains of non-group D viridans group streptococci. Optimal sensitivity (>99%) and specificity (97%) of the bile-esculin test can be obtained with a bile concentration of 40%, a standardized inoculum of 106 CFU, and incubation for 24 h.

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Palmer,, Robert J., Sharon M. Gordon, John O. Cisar, and Paul E. Kolenbrander. "Coaggregation-Mediated Interactions of Streptococci and Actinomyces Detected in Initial Human Dental Plaque." Journal of Bacteriology 185, no. 11 (2003): 3400–3409. http://dx.doi.org/10.1128/jb.185.11.3400-3409.2003.

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ABSTRACT Streptococci and actinomyces that initiate colonization of the tooth surface frequently coaggregate with each other as well as with other oral bacteria. These observations have led to the hypothesis that interbacterial adhesion influences spatiotemporal development of plaque. To assess the role of such interactions in oral biofilm formation in vivo, antibodies directed against bacterial surface components that mediate coaggregation interactions were used as direct immunofluorescent probes in conjunction with laser confocal microscopy to determine the distribution and spatial arrangeme

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Gilmer, Daniel B., Jonathan E. Schmitz, Chad W. Euler, and Vincent A. Fischetti. "Novel Bacteriophage Lysin with Broad Lytic Activity Protects against Mixed Infection by Streptococcus pyogenes and Methicillin-Resistant Staphylococcus aureus." Antimicrobial Agents and Chemotherapy 57, no. 6 (2013): 2743–50. http://dx.doi.org/10.1128/aac.02526-12.

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ABSTRACTMethicillin-resistantStaphylococcus aureus(MRSA) andStreptococcus pyogenes(group A streptococcus [GrAS]) cause serious and sometimes fatal human diseases. They are among the many Gram-positive pathogens for which resistance to leading antibiotics has emerged. As a result, alternative therapies need to be developed to combat these pathogens. We have identified a novel bacteriophage lysin (PlySs2), derived from aStreptococcus suisphage, with broad lytic activity against MRSA, vancomycin-intermediateS. aureus(VISA),Streptococcus suis,Listeria,Staphylococcus simulans,Staphylococcus epiderm

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Huang, Xuelian, Christopher M. Browngardt, Min Jiang, Sang-Joon Ahn, Robert A. Burne, and Marcelle M. Nascimento. "Diversity in Antagonistic Interactions between Commensal Oral Streptococci and Streptococcus mutans." Caries Research 52, no. 1-2 (2017): 88–101. http://dx.doi.org/10.1159/000479091.

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Arginine metabolism via the arginine deiminase system (ADS) of oral bacteria generates ammonia, which can increase the pH of oral biofilms and decrease the risk for dental caries. Antagonistic interactions between ADS-positive and cariogenic bacteria in oral biofilms may be an important ecological determinant of caries. This study investigated the antagonistic potential and mechanisms of clinical isolates of arginolytic streptococci on and by Streptococcus mutans UA159, a well-characterized cariogenic human isolate. Low-passage isolates of Streptococcus gordonii, Streptococcus sanguinis, Strep

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Silva, Léa Assed Bezerra da, Paulo Nelson-Filho, Gisele Faria, Maria Cristina Monteiro de Souza-Gugelmin, and Izabel Yoko Ito. "Bacterial profile in primary teeth with necrotic pulp and periapical lesions." Brazilian Dental Journal 17, no. 2 (2006): 144–48. http://dx.doi.org/10.1590/s0103-64402006000200012.

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The objective of this study was to evaluate the bacterial profile in root canals of human primary teeth with necrotic pulp and periapical lesions using bacterial culture. A total of 20 primary teeth with necrotic pulp and radiographically visible radiolucent areas in the region of the bone furcation and/or the periapical region were selected. After crown access, 4 sterile absorbent paper points were introduced sequentially into the root canal for collection of material. After 30 s, the paper points were removed and placed in a test tube containing reduced transport fluid (RTF) and were sent fo

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Cheng, X., S. Redanz, P. Treerat, et al. "Magnesium-Dependent Promotion of H2O2 Production Increases Ecological Competitiveness of Oral Commensal Streptococci." Journal of Dental Research 99, no. 7 (2020): 847–54. http://dx.doi.org/10.1177/0022034520912181.

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The pyruvate oxidase (SpxB)–dependent production of H2O2 is widely distributed among oral commensal streptococci. Several studies confirmed the ability of H2O2 to antagonize susceptible oral bacterial species, including caries-associated Streptococcus mutans as well as several periodontal pathobionts. Here we report a potential mechanism to bolster oral commensal streptococcal H2O2 production by magnesium (Mg2+) supplementation. Magnesium is a cofactor for SpxB catalytic activity, and supplementation increases the production of H2O2 in vitro. We demonstrate that Mg2+ affects spxB transcription

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Salvador, Rogério, Ernst Eckehardt Muller, Julio César de Freitas, Julio Hermann Leonhadt, Lucienne Garcia Pretto-Giordano, and Juliana Alves Dias. "Isolation and characterization of Streptococcus spp. group B in Nile tilapias (Oreochromis niloticus) reared in hapas nets and earth nurseries in the northern region of Parana State, Brazil." Ciência Rural 35, no. 6 (2005): 1374–78. http://dx.doi.org/10.1590/s0103-84782005000600023.

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The objective of this study was to isolate and characterize Streptococcus spp. in Nile tilapias (Oreochromis niloticus) reared in net-pens and earth nurseries. Eight intensive tilapia-rearing farms were investigated in north Paraná, Brazil from April 1st 2001 to April 30th 2002. The fish were reared in a system of hapas nets on four farms and in earth nurseries on other four farms. A total of 370 samples were analyzed of material collected from 120 fish (brain, liver, kidney, skin scrapes, ascites liquid and eye) that were sown on BHI agar (Brain Heart Infusion) supplemented with 1% yeast extr

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Kitten, Todd, Cindy L. Munro, Aijuan Wang, and Francis L. Macrina. "Vaccination with FimA from Streptococcus parasanguis Protects Rats from Endocarditis Caused by Other Viridans Streptococci." Infection and Immunity 70, no. 1 (2002): 422–25. http://dx.doi.org/10.1128/iai.70.1.422-425.2002.

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ABSTRACT The FimA protein of Streptococcus parasanguis is a virulence factor in the rat model of endocarditis, and immunization with FimA protects rats against homologous bacterial challenge. Because FimA-like proteins are widespread among the oral streptococci, the leading cause of native valve endocarditis, we evaluated the ability of this vaccinogen to protect rats when challenged by other streptococcal species. Here we report that FimA vaccination produced antibodies that cross-reacted with and protected against challenge by the oral streptococci S. mitis, S. mutans, and S. salivarius. Fim

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