Comparison of antimicrobial susceptibilities of bacterial isolates between cured and uncured cases of bovine mastitis

摘要

To evaluate the effect of antimicrobial susceptibility on outcomes, we compared the minimum inhibitory concentrations (MICs) for , , and the family from cured and uncured mastitis cases; milk shipment for uncured cases could not be resumedwithin 3 weeks after initial clinical examination. A higher MIC of ampicillin and a higher MIC of cefazolin for isolates were observed for cured rather than uncured cases with differences in ≥2 tubes. Endotoxins are generally released from uponantimicrobial treatment; their amounts are presumed to be greater in mastitis cases resulting from β-lactam antibiotic-susceptible rather than -resistant microbes. Forstaphylococcal and streptococcal isolates, the MIC and MIC of β-lactam antibiotics were similar for cured and uncured cases.