Letter to the Editor: Methicillin-Resistant Staphylococcus epidermidis in Organic Milk Production

摘要

A dairy cow from a farm for organic milk production, where the use of antibiotics is restricted, was diagnosed twice within 2 mo with subclinical mastitis caused by methicillin-resistant Staphylococcus epidermidis. The strains also displayed resistance to chloramphenicol and harbored streptomycin- and trimethoprim-resistance genes that remained silent in vitro. The second isolate contained an additional aminoglycoside-resistance gene indicating the potential acquisition of resistance by horizontal gene transfer.