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In vitro activity of 10 antimicrobial agents against bacteria isolated from cows with clinical mastitis
Author(s) -
GuérinFaublée V.,
Carret G.,
Houffschmitt P.
Publication year - 2003
Publication title -
veterinary record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.261
H-Index - 99
eISSN - 2042-7670
pISSN - 0042-4900
DOI - 10.1136/vr.152.15.466
Subject(s) - cloxacillin , penicillin , microbiology and biotechnology , neomycin , ampicillin , colistin , mastitis , antimicrobial , cefazolin , cephalosporin , streptomycin , minimum inhibitory concentration , biology , antibiotics
The susceptibility of 495 strains of bacteria, recently isolated in France from cows with clinical mastitis, to 10 antimicrobial agents ‐ penicillin G, cloxacillin, oxacillin, cephalexin, cefazolin, cephapirin, cefquinome, neomycin, ampicillin and colistin ‐ was determined by measuring their minimum inhibitory concentrations (MICs). Overall, the levels of resistance were very low except for staphylococci and penicillin G. The 167 streptococcal strains were susceptible to all of the β‐lactams tested, but six (3.6 per cent) were highly resistant to neomycin. Of the 171 staphylococcal isolates, 36.2 per cent were resistant to penicillin G, one strain of Staphylococcus sciuri was classified as methicillin‐resistant, but they were all susceptible to neomycin. None of the 122 strains of Escherichia coli was resistant to colistin, but 12 had high MIC values for one or more of the cephalosporins.