Mastite subclínica por Staphylococcus coagulase negativa em ovinos de corte

Abstract

Microorganisms that cause mastitis were isolated in a herd of sheep and their sensitivity to antimicrobials was tested. Twenty-one sheep had their mammary glands monitored during lactation. Eighty-eight milk sample from CMT-positive sheep were analyzed in order to isolate the etiologic agent of mastitis. Coagulase negative Staphylococcus were isolated from 29.5% of samples. Ampicillin and penicillin were the antimicrobials with higher number of resistant strains. The importance of coagulase negative staphylococci has been demonstrated, especially S. lentus and S. sciuri as a cause of ovine mastitis.

Genotypic identification and antimicrobial susceptibility profiles of coagulase-negative staphylococci isolated from sheep’s milk

“…Resistance to these antimicrobial classes has been commonly reported in other studies of CoNS. A high percentage of ampicillin and penicillin resistance in sheep isolates was reported by Tejada et al (2012), at 73.1% and 69.2% respectively.…”

“…Other CoNS species in addition to S. epidermidis and S. chromogenes may be reported as more prevalent causes of subclinical mastitis in sheep. In the Brazilian state of Rio Grande do Sul, staphylococci were isolated in 29.5% of milk samples from sheep with mastitis (26/88), and S. lentus was the most prevalent species (26.9%), observed in seven samples (TEJADA et al, 2012). The authors also identified other species of CoNS, including S. sciuri (19.2%), S. vitulinus (7.7%), S. haemolyticus (3.8%), and S. epidermidis (3.8%).…”