Antimicrobial Resistance Profiles of Microorganisms Isolated from Milk Samples from Clinical Mastitis and Subclinical-infected Quarters inDairy Herds from Chile

摘要

Both clinical mastitis and subclinical intramammary infections are the main reasons for the use of antimicrobials in dairy cattle. On the other hand, antimicrobial resistance (AMR) in animal production has become a main concern during the last decades(Erskine et al., 2002). Dairy production, in particular, has been under social and public scrutiny. Even so, available AMR retrospective studies have shown no particular increase in AMR (Erskine et al., 2002; Pol and Ruegg, 2007). The rise on public awareness to multidrug resistant microorganisms have generated new regulations on the monitoring and use of antimicrobials. The implementation of any endeavor on prudent use of antibiotic should be based in reference baseline evaluations and sound data. Nevertheless, a limited number of studies have reported on AMR profiles of common mastitis pathogens in dairy herds in South America (San Martin et al., 2002). We report on AMR profiles of common mastitis pathogens from nation-long Chilean dairy operationssubmitted to the main veterinary diagnostic laboratory during year 2016.