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Genotyping and antimicrobial resistance of Streptococcus uberis isolated from bovine clinical mastitis


Autoři: Tiago Tomazi aff001;  Gustavo Freu aff001;  Bruna Gomes Alves aff001;  Antonio Francisco de Souza Filho aff003;  Marcos Bryan Heinemann aff003;  Marcos Veiga dos Santos aff001
Působiště autorů: Department of Animal Production and Nutrition, Milk Quality Research Laboratory (Qualileite), University of São Paulo, Pirassununga, Brazil aff001;  Department of Population Medicine and Diagnostic Sciences, School of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America aff002;  Department of Preventive Veterinary Medicine and Animal Health, Laboratory of Bacterial Zoonosis, University of São Paulo, São Paulo, Brazil aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0223719

Souhrn

A genotypic characterization of Streptococcus uberis isolated from clinical mastitis (CM) in dairy cows, and the association of Strep. uberis genotypes and antimicrobial susceptibility (AMS) was performed. A total of 89 isolates identified as Strep. uberis from 86 dairy cows with CM in 17 dairy herds of Southeastern Brazil were genotyped using random amplified polymorphic DNA (RAPD) analysis. After genotyping, two clusters (I and II) were created according to RAPD types. A commercial broth microdilution test was used to determine the susceptibility of Strep. uberis isolates to 8 antimicrobials (ampicillin, ceftiofur, cephalothin, erythromycin, penicillin, penicillin+novobiocin, pirlimycin and tetracycline). For each antimicrobial, we determined the minimal inhibitory concentrations that inhibit 50% (MIC50) and 90% (MIC90) of Strep. uberis strains. Differences in AMS among genotypic clusters were evaluated using mixed regression models. Overall, a great polymorphism (56 RAPD-types) was found among Strep. uberis isolates, although a higher genetic similarity (based on the PCR bands features) was observed within herds after genotypic clustering. No differences in AMS were observed among clusters. Strep. uberis isolated from bovine CM were resistant to most antimicrobials, with the exception of cephalothin and penicillin+novobiocin.

Klíčová slova:

Antimicrobial resistance – Antimicrobials – Bovine mastitis – Mastitis – Penicillin – Streptococcus – Tetracyclines – Random amplified polymorphic DNA technique


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