SciELO - Scientific Electronic Library Online

 
vol.80 issue3Seroepidemiological survey of caprine arthritis encephalitis and profile of goat breeding systems in the region of Baixo Médio São Francisco (BA)Seroepidemiology of bovine leptospirosis and brucellosis in family farm rural properties in the State of Paraíba, northeastern Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Arquivos do Instituto Biológico

On-line version ISSN 1808-1657

Abstract

COSTA, Geraldo Márcio da et al. Antimicrobial resistance in Staphylococcus aureus isolated from mastitis in dairy herds from the state of Minas Gerais, Brazil. Arq. Inst. Biol. [online]. 2013, vol.80, n.3, pp.297-302. ISSN 1808-1657.  https://doi.org/10.1590/S1808-16572013000300006.

Staphylococcus aureus (S. aureus) stands out as one of the most common etiological agents of bovine mastitis, currently causing major economic losses to dairy farming. In order to evaluate the sensitivity of this micro-organism to antimicrobials, 352 isolates from 35 dairy herds located in the state of Minas Gerais were submitted to antibiogram tests, using the disc diffusion technique. Nitrofurantoin and the Associations of neomycin, bacitracin and tetracycline (NBT), as well as penicillin, nafcillin and dihydrostreptomycin (PND), showed 100% efficiency in vitro. There were low resistance rates in the group of cephalosporins, with values of 0, 0.28 and 0.40% for cefquimona, cephalothin, and ceftiofur, respectively. Among the aminoglycosides, there was 1.69% resistance to gentamicin and 3.35% for neomycin. The highest resistance was observed for polymyxin B (82%), followed by betalactams, ampicillin and penicillin, with resistance rates of 80.92 and 80.45%, respectively. Moderate levels of resistance were observed for tetracycline, lincomycin, cefoperazone and sulfazotrim. Among the tested isolates, 65 (18.15%), coming from 24 of the 35 herds studied, showed multidrug resistance (MAR index ≥ 0.2). The results pointed out to high variation in antimicrobial resistance profiles and the occcurrence of multidrug resistance among some studied strains, highlighting the importance of antibiogram tests for the choice of an appropriate drug to be used for the treatment or prevention of mastitis caused by S. aureus.

Keywords : Staphylococci; antibiotics; susceptibility; treatment.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License