Surto de mastite bovina causada por linhagens de Pseudomonas aeruginosa multirresistentes aos antimicrobianos

Uncommon outbreak of mastitis caused by Pseudomonas aeruginosa strains in 19 cows was reported. Enrofloxacin (73.7%) and danofloxacin were in vitro effective against those strains. In vitro multiple drug resistance of the isolated bacteria was observed to five or more conventional antimicrobials used for mammary therapy, including ampicillin (100.0%), cefalexin (100.0%), cloxacillin (100.0%), gentamicin (100.0%), penicillin/novobiocin (100.0%), cefoperazone (52.6%), tetracycline (100.0%), florfenicol (94.7%), and neomycin (73.7%). Epidemiological findings, clinical signs, in vitro susceptibility profile, control measures, and public health risks were discussed in cows infected by P. aeruginosa.