Incidence and characterization of mastitic bovine milk antimicrobial multi-drug resistant bacteria in middle west region of São Paulo, Brazil

• Autor(a) principal: Moreno, Gilberto
• Data de Publicação: 1997
• Outros Autores: Lopes, Carlos Alberto de Magalhães, Gottschalk, Arnold Frederico, Modolo, José Rafael
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Veterinary Research and Animal Science
• Texto Completo: https://www.revistas.usp.br/bjvras/article/view/50295
• topic: Bactérias patogênicas; Mastite bovina; Resitência a drogas; Bacterial pathogens; Bovine mastitis; Drug resistance

A study of the incidence and characterization of bacteria multi-drug resistance isolated from 750 milk samples of cows affected by subclinical mastitis in middle west region of São Paulo, Brazil, was carried out. Staphylococci (75.8%) (mainly represented by Staphylococcus aureus andStaphylococcus epidermidis) and Escherichia coli(7.1 % ) were most frequently isolated bacteria. Most milk samples yielded pure cultures, but associations of pathogens were found in some samples. In vitro multi-drug resistance to six antibiotics (penicillin, ampicillin, dicloxacillin, streptomycin, tetracycline and oxacillin), was observed only among Gram-negative isolates and in some Staphylococcus aureus (39.9%) strains. Remaining Gram positive bacteria, were all sensitive to drugs tested. Multi-drug resistance in mastitogenic bacteria remain a problem difficult to be solved or controlled, mainly by short term programmes.