Comparison of the sensitivity patterns of Staphylococci isolated from bovine udders in 1974 and 1980
Groothuis, D.G.; Frik, J.F.
Tijdschrift Voor Diergeneeskunde 107(23): 883-888
1982
ISSN/ISBN: 0040-7453 PMID: 7157324 Document Number: 189824
In 1973-1975 the minimum inhibitory concentrations (MIC) for 693 strains of Staphylococcus aureus isolated from bovine udders originating either from the Dutch randomized mastitis survey (A) or from farms with mastitis problems (B) were determined. The antibiotics used were penicillin, nafcillin, cloxacillin, neomycin, streptomycin, lincomycin, novobiocin, rifamycin and chlortetracycline. In 1980, 370 strains from the randomized survey were examined for the same antibiotics plus cephalonium, kanamycin and quinaldofur. The proportion of strains originating from the randomized surveys showing a MIC for penicillin higher than 0.16 IU/ml was 35.6% in 1974 and 34.1% in 1980. Only minor changes were observed for the majority of other drugs studied. Despite the continued use of antimicrobial drugs in the treatment of mastitis, there has been no change in the sensitivity of staphylococci since 1974.