Resistance to antibiotics in Staphylococcus aureus isolated from dairy cow mastitis, milk, udder smears, and milking installation

Veterinarni Medicina 44, 1999, 115-120

During the period from 1993 to 1997, the sensitivity of 8 antibiotics in 320 strains of Staphylococcus aureus was studied by means of disc diffuse method. The S. aureus strains had been isolated from both clinical and latent diary cow mastitis, milked milk, smears taken from the skin of dairy cow udder, milking installation, and environment. The occurrence of resistant S. aureus strains was as follows: 22.5%, with penicillin, 6.9% with ampicillin, 1.8% with oxacillin, 7.2% with tetracycline, 2.2% with chloramphenicol, 14.7% with streptomycin, 1.6% with neomycin, and 0.6% with erythromycin. A total of 63.4% of S. aureus strains were sensitive to the antibiotics observed, 24.7% of strains, however, were resistant only to one antibiotic. 5.6% of strains were resistant to two antibiotics at the same time, 4.1% of strains to three, 1.6% to four, and 0.3% of strains were resistant to five and six antibiotics at the same time

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