ANTIMICROBIAL DRUG RESISTANCE OF Staphylococcus sp ISOLATED FROM HEALTHY LACTATING COWS OF AN ORGANIC FARM.

D. RODOLPHO, J. M. MARIN, M. L. C. ARAUJO

Resumo


A total of 95 Staphylococcus sp strains, isolated from 129 apparently healthy lactating cows from an organic farm situated in São Paulo State, Brazil, were characterized for resistance to 7 antimicrobial drugs. Resistance to penicillin was most frequently (96.8%) found, followed by resistance to streptomycin (67.3%), norfloxacin (31.5%) and vancomycin (5.2%). β-Lactamase production was found in 21.0% of the isolates. Multidrug resistant isolates were common and two patterns of phenotypes were found in 78.9% of the isolates. These results showed that cows not exposed to antimicrobial drugs for five years still presented a high level of antimicrobial resistance among the colonizing bacteria of these animals.
KEY-WORDS: Staphylococcus sp. Antimicrobial drug resistance. Homeopathic treatment. Multidrug resistance.

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DOI: http://dx.doi.org/10.15361/2175-0106.2006v22n1p37-42