ANTIMICROBIAL RESISTANCE PATTERNS OF STAPHYLOCOCCUS AUREUS ISOLATED FROM INTRAMAMMARY INFECTIONS BEFORE AND AFTER THE DRY PERIOD OF DAIRY CATTLE IN CANADA

摘要

It is recommended that all quarters of all cows are treated with an approved long-acting dry cow intramammary antibiotic product. However, as awareness increases regarding the routine use of antibiotics in food animal production systems, blanket DCT has come under scrutiny as a possible factor contributing to antimicrobial resistance (AMR). Recent reports suggest that AMR can affect the cure rate of new IMI (Osteras et al. 1999). The objective of this study was to determine AMR patterns for S. aureus organisms from dairy farms in Canada, as well as to examine the effect of DCT on changes in S. aureus AMR patterns after calving and to investigate the impact of AMR on the cure of S. aureus in the dry period.