Resistance patterns of ovine mastitis pathogens
Winter, P.; Höflechner, A.; Baumgartner, W.
Berliner und Münchener Tierärztliche Wochenschrift 112(6-7): 216-222
1999
ISSN/ISBN: 0005-9366 PMID: 10472717 Document Number: 504368
The minimal inhibitory concentration of mastitis causing pathogens isolated from sheep at Wein University (Austria) in January 1995 to 12 different drugs was determined using the Sensititre-microplate method. 73 Staphylococcus and 8 Streptococcus strains were examined. The following Staphylococcus strains were found: S. aureus (11), S. epidermidis (34), S. chromogenes and S. xylosus (6 each), S. hyicus and S. warneri (each 5) as well as S. sciuri and S. simulans (3 each). MIC values to penicillin, amoxycillin and ampicillin of 2 penicillinase-positive S. aureus-strains were more than 4.0 micro g/ml. The remaining isolates and most of the coagulase-negative Staphylococcus spp. displayed MIC values up to 1.0 micro g/ml to all beta -lactam antibiotics except cloxacillin. Against the cephalosporins (except cephalexin) and aminoglycosides, very low MIC values were observed for Staphylococcus. Streptococcus spp. exhibited MIC values in the range of 0.06 to 0.5 micro g/ml against beta -lactam antibiotics, with the exception of cloxacillin, cefoperazone and cefquinome and spiramycin.