Findings from Zoetis Inc. in Pharmaceuticals Reported (Antimicrobial Susceptibility of Mastitis Pathogens Isolated From North American Dairy Cattle, 2011-2022).

A recent study conducted by veterinary laboratories across North America between 2011 and 2022 found that mastitis pathogens in dairy cows have shown low resistance to common antimicrobial drugs. The study tested bacterial isolates from Streptococcus dysgalactiae, Streptococcus uberis, Staphylococcus aureus, and Escherichia coli for antimicrobial susceptibility. The results indicate that there have been no substantial changes in the in vitro susceptibility to antimicrobial drugs over the 12 years of the study. This research supports the conclusion that resistance to common antimicrobial drugs among mastitis pathogens remains low. [Extracted from the article]