Bibliografías temáticas / Corynebacterium bovis

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Artículos de revistas

Literatura académica sobre el tema "Corynebacterium bovis"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 17 de febrero de 2022

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Artículos de revistas sobre el tema "Corynebacterium bovis"

Watts, Jeffrey L., and Silvia Rossbach. "Susceptibilities of Corynebacterium bovis and Corynebacterium amylocolatum Isolates from Bovine Mammary Glands to 15 Antimicrobial Agents." Antimicrobial Agents and Chemotherapy 44, no. 12 (2000): 3476–77. http://dx.doi.org/10.1128/aac.44.12.3476-3477.2000.

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ABSTRACT Coryneform bacteria are frequently isolated from bovine mastitis and are associated with economic losses. Generally, the MICs of the 15 antimicrobial agents tested at which 90% of the isolates tested are inhibited for 46 Corynebacterium bovis and 13Corynebacterium amylocolatum strains were low. These are the first quantitative antimicrobial susceptibility data available for coryneforms from bovine mastitis. Data from this study suggest that comparable corynebacteria from humans have a much higher level of antimicrobial resistance to a variety of antimicrobial agents.

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Fagre, Anna C., Uma Pugazhenthi, Christopher Cheleuitte-Nieves, et al. "Antimicrobial Susceptibility of Corynebacterium bovis Isolates from Immunodeficient Rodents." Comparative Medicine 71, no. 3 (2021): 210–14. http://dx.doi.org/10.30802/aalas-cm-20-000107.

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Corynebacterium bovis, the causative agent of hyperkeratotic dermatitis in immunodeficient mice, is a significant problem in preclinical oncology research. Infection results in lifelong skin colonization and a decrease in successful engraftment of patient-derived xenograft tumor models. The use of antimicrobial agents for C. bovis is controversial in light of reports of poor efficacy and the possibility of selection for resistant strains. The purpose of this study was to describe the antimicrobial susceptibilities of C. bovis isolates obtained exclusively from immunodeficient rodents in order to aid in antimicrobial dose determination. Between 1995 and 2018, 15 isolates were collected from 11 research institutions across the United States. Antimicrobial susceptibility testing was performed for 24 antimicrobials commonly used against gram-positive bacteria. Our results provide an updated understanding of the susceptibility profiles of rodent C. bovis isolates, indicating little variability between geographically and temporally distant isolates. These results will facilitate appropriate antimicrobial use to prevent and treat C. bovis infections in immunodeficient rodents.

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Miedel, Emily L., Natalie H. Ragland, Andrea R. Slate, and Robert W. Engelman. "Persistent Corynebacterium bovis Infectious Hyperkeratotic Dermatitis in Immunocompetent Epidermal-Mutant dep/dep Mice." Veterinary Pathology 57, no. 4 (2020): 586–89. http://dx.doi.org/10.1177/0300985820922219.

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During a previously reported program-wide Corynebacterium bovis outbreak, both immunocompetent depilated ( dep/dep) mutant mice and transgenic mice that express the papillomavirus E6 oncoprotein became persistently infected with C. bovis. An orthokeratotic, hyperkeratotic, acanthotic dermatitis developed in the C. bovis–infected dep/dep mice, which remained C. bovis PCR-positive for >45 days prior to euthanasia as part of the program-wide C. bovis eradication effort. Since both affected strains of mice have altered skin homeostasis, immune status or the presence of hair may not alone be sufficient to explain strain susceptibility to C. bovis–related cutaneous disease. In order to avoid invalidation of preclinical studies due to C. bovis infection, it may be necessary to isolate immunodeficient mouse strains, implement facililty-wide surveillance for C. bovis, and sterilize equipment with vaporized hydrogen peroxide.

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Cheleuitte-Nieves, Christopher, Ryan D. Heselpoth, Lars F. Westblade, Neil S. Lipman, and Vincent A. Fischetti. "Searching for a Bacteriophage Lysin to Treat Corynebacterium bovis in Immunocompromised Mice." Comparative Medicine 70, no. 4 (2020): 328–35. http://dx.doi.org/10.30802/aalas-cm-19-000096.

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Corynebacterium bovis is the causative agent of Corynebacterium-associated hyperkeratosis in immunocompromised mice. The resulting skin pathology can be profound and can be associated with severe wasting, making the animals unsuitable for research. Although the administration of antibiotics is effective in resolving clinical symptoms, antibiotics do not eradicate the offending bacterium. Furthermore, antibiotic use may be contraindicated as it can affect tumor growth and is associated with Clostridioides difficile enterotoxemia in highly immunocompromised murine strains. Lysins, which are lytic enzymes obtained from bacteriophages, are novel antimicrobial agents for treating bacterial diseases. The advantage of lysins are its target specificity, with minimal off-target complications that could affect the host or the biology of the engrafted tumor. The aim of this study was to identify lysins active against C. bovis. Chemical activation of latent prophages by using mitomycin C in 3 C. bovis isolates did not cause bacteriophage induction as determined through plaque assays and transmission electron microscopy. As an alternative approach, 8 lysins associated with other bacterial species, including those from the closely related species C. falsenii, were tested for their lytic action against C. bovis but were unsuccessful. These findings were congruent with the previously reported genomic analysis of 21 C. bovis isolates, which failed to reveal bacteriophage sequences by using the PHAST and PHASTER web server tools. From these results, we suggest C. bovis is among those rare bacterial species devoid of lysogenic bacteriophages, thus making the identification of C. bovis-specific lysins more challenging. However, C. bovis may be a useful model organism for studying the effects of antiphage systems.

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Pearson, Emily C., Umarani Pugazhenthi, Derek L. Fong, et al. "Metaphylactic Antibiotic Treatment to Prevent the Transmission of Corynebacterium bovis to Immunocompromised Mouse Offspring." Journal of the American Association for Laboratory Animal Science 59, no. 6 (2020): 712–18. http://dx.doi.org/10.30802/aalas-jaalas-20-000005.

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Current methods for eradicating Corynebacterium bovis, such as depopulation, embryo transfer, and cesarean rederivation followed by cross fostering, are expensive, complex, and time-consuming. We investigated a novel method to produce immunocompromised offspring free of C. bovis from infected NOD. Cg-PrkdcscidIl2rgtm1Wgl/SzJ (NSG) breeding pairs. Adult NSG mice were infected with C. bovis, paired, and randomly assigned to either a no-antibiotic control group (NAB, n = 8) or a group that received amoxicillin–clavulanic acid (0.375 mg/mL) in their drinking water for a mean duration of 7 wk (AB group, n = 7), spanning the time from pairing of breeders to weaning of litters. The AB group also underwent weekly cage changes for 3 wk after pairing to decrease intracage C. bovis contamination, whereas the NAB mice received bi-weekly cage changes. Antibiotics were withdrawn at the time of weaning. All litters (n = 7) in the AB group were culture- and qPCR-negative for C. bovis and remained negative for the duration of the study, whereas all litters in the NAB group (n = 6) remained C. bovis positive. A single adult from each breeding pair was sampled at weaning and at 5 and 10 wk after weaning to confirm the maintenance of (NAB) or to diagnose the reemergence (AB) of C. bovis infection. By the end of the study, C. bovis infection had returned in 3 of the 7 (43%) tested AB adults. Our data suggest that metaphylactic antibiotic use can decrease viable C. bovis organisms from adult breeder mice and protect offspring from infection. However, using antibiotics with frequent cage changing negatively affected breeding performance. Nevertheless, this technique can be used to produce C. bovis-free NSG offspring from infected adults and may be an option for salvaging infected immunocompromised strains of mice that are not easily replaced.

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Bexiga, Ricardo, Helena Pereira, Octávio Pereira, et al. "Observed reduction in recovery of Corynebacterium spp. from bovine milk samples by use of a teat cannula." Journal of Dairy Research 78, no. 1 (2010): 9–14. http://dx.doi.org/10.1017/s0022029910000609.

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Although Corynebacterium bovis and coagulase-negative staphylococci are frequently the most commonly isolated bacteria from milk samples submitted for identification of pathogens causing intramammary infection, the individual quarter somatic cell count (SCC) from those samples is most often low. The present study aimed at evaluating the difference in bacteriology results from milk sampled by the standard technique (as recommended by the National Mastitis Council) and by the use of a teat cannula surpassing the teat canal, since C. bovis is often only found in the teat canal. Single quarter milk samples were collected in duplicate from 132 dairy cows on a commercial dairy farm using the standard milk sampling technique and also using a cannula introduced into the teat. Two groups of quarters were sampled: a group that was selected randomly at cow and quarter level and a group that was selected based on having SCC >200 000 cells/ml at the previous milk recording at cow level and on California mastitis test result at quarter level. Bacteriological culture performed on the samples yielded 29 Corynebacterium spp. isolates from the samples collected with the standard technique and 6 isolates from the samples collected with a cannula. Bacteriological culture yielded 73 and 100 culture negative samples respectively with the standard and the alternative sampling technique. A significant difference between the two sampling techniques was observed for recovery of Corynebacterium spp. and for no-growth samples. There was no significant difference in the isolation of Corynebacterium spp. or other bacterial species when using the standard technique before or after sampling with the cannula; thus the observed difference in bacteriology results could not be attributed to a particular sampling order. No significant change was observed overall in individual quarter SCC measured on the sampling day and 7 d later. Our results agree with several studies showing that Corynebacterium bovis often colonizes the teat canal, without causing true intramammary infection.

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Bregeon, B., H. Aubert, S. Barbarot, M. Lebfevre, and J. F. Stalder. "Infection cutané à Corynebacterium bovis mimant une diphtérie cutanée." Annales de Dermatologie et de Vénéréologie 141, no. 12 (2014): S453—S454. http://dx.doi.org/10.1016/j.annder.2014.09.504.

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Aoki, Takanori, Koji Kitazawa, Hideto Deguchi, and Chie Sotozono. "Current Evidence for Corynebacterium on the Ocular Surface." Microorganisms 9, no. 2 (2021): 254. http://dx.doi.org/10.3390/microorganisms9020254.

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Corynebacterium species are commonly found in the conjunctiva of healthy adults and are recognized as non-pathogenic bacteria. In recent years, however, Corynebacterium species have been reported to be potentially pathogenic in various tissues. We investigated Corynebacterium species on the ocular surface and reviewed various species of Corynebacterium in terms of their antimicrobial susceptibility and the underlying molecular resistance mechanisms. We identified a risk for Corynebacterium-related ocular infections in patients with poor immunity, such as patients with diabetes or long-term users of topical steroids, and in those with corneal epithelial damage due to trauma, contact lens wear, lagophthalmos, and trichiasis. The predominant strain in the conjunctiva was C. macginleyi, and the species associated with keratitis and conjunctivitis were C. macginleyi, C. propinquum, C. mastitidis, C. pseudodiphtheriticum, C. accolens, C. striatum, C. xerosis, and C. bovis. Overall, Corynebacterium species present on the ocular surface were resistant to quinolones, whereas those in the nasal cavity were more susceptible. The prevalence of fluoroquinolone-resistant Corynebacterium has not changed in the past 10 years; however, Corynebacterium species remain susceptible to third-generation cephems. In conclusion, the use of third-generation cephems should be a reasonable and pragmatic approach for treatment of ocular infections caused by Corynebacterium species.

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Watts, J. L., D. E. Lowery, J. F. Teel, C. Ditto, J. S. Horng, and S. Rossbach. "Phylogenetic Studies on Corynebacterium bovis Isolated from Bovine Mammary Glands." Journal of Dairy Science 84, no. 11 (2001): 2419–23. http://dx.doi.org/10.3168/jds.s0022-0302(01)74691-7.

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Achermann, Yvonne, Andrej Trampuz, Fabricio Moro, Jürg Wüst, and Markus Vogt. "Corynebacterium bovis shoulder prosthetic joint infection: the first reported case." Diagnostic Microbiology and Infectious Disease 64, no. 2 (2009): 213–15. http://dx.doi.org/10.1016/j.diagmicrobio.2009.02.003.

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