Antimicrobial susceptibility profile of Streptococcus agalactiae strains isolated from bovine mastitis

Authors

DOI:

https://doi.org/10.11606/issn.1678-4456.bjvras.2021.178109

Keywords:

Resistance, Intramammary infection, Multidrug resistance, Bovine diseases

Abstract

Bovine mastitis is the most important disease of dairy herds worldwide. Its main etiologic agents are bacteria, including Streptococcus agalactiae. The importance of this agent in bovine mastitis is because it is highly contagious and has a high impact on the occurrence of clinical mastitis cases and in the increase of the bulk milk somatic cell counts. The dry cow therapy and the treatment of the clinical mastitis cases stand out among the measures to control intramammary infections in cows. However, these strategies require knowledge about the antimicrobial susceptibility of the causal microorganisms. Thus, this study aimed to evaluate the antimicrobial susceptibility of 89 S. agalactiae strains isolated from bovine mastitis between the years 2004 and 2008 in dairy herds from Campo das Vertentes region, Minas Gerais State, Brazil. The disc diffusion technique was used and the antimicrobials currently used in mastitis therapy were tested. The isolates tested showed 100% susceptibility to chloramphenicol, ceftiofur, cefotaxime, enrofloxacin, and cefquinome. High frequencies of susceptibility (>95%) were also observed for the beta-lactams (penicillin G, ampicillin, and oxacillin), cephalosporins (cephalotin, ceftiofur, cefotaxime, cefoperazone, and cefquinome), florfenicol, gentamicin, lincomycin, nitrofurantoin, and sulfamethoprim. The strains showed high frequencies of resistance to neomycin (15.74%), and tetracycline (21.35%). Multidrug resistance was detected in 2.25% of the tested isolates. The results pointed to variations in the antimicrobial susceptibility profiles of the studied strains and the importance of the use of the susceptibility tests to determine the correct antimicrobial to be applied in the treatment of bovine mastitis caused by S. agalactiae. The high frequencies of resistance observed to some antimicrobials, such as neomycin and tetracycline, commonly used in the treatment of mastitis and other pathologies, highlighted the need for more judicious use of antimicrobials on dairy farms.

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Published

2021-06-03

How to Cite

Costa, G. M. da, Ribeiro, N. A., Gonçalves, M. S., Silva, J. R. da, Custódio, D. A. da C., & Mian, G. F. (2021). Antimicrobial susceptibility profile of Streptococcus agalactiae strains isolated from bovine mastitis. Brazilian Journal of Veterinary Research and Animal Science, 58, e178109. https://doi.org/10.11606/issn.1678-4456.bjvras.2021.178109

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