Staphylococcus aureus isolated from intramammary infection in immunologically protected goats

Abstract

In a goats farm with 86 goats immunologically protected by vaccination against gangrenous mastitis, evolved clinical and subclinical intramammary infections. 30 milk samples from goats with clinical mastitis evolving and 16 milk samples from apparently healthy goats were collected. Following bacteriological exams 36 Staphylococcus aureus strains were isolated and identified using standard protocols, 25 (69.44%) being isolated in pure culture and 11 (30,55%) in association with other bacteria: Escherichia coli, Pasteurella haemolytica, Klebsiella oxytoca. Bacterial strains were morphologically identified using Gram staining and biochemical tests. The antibiotic susceptibility was tested for 15 strains of Staphylococcus aureus on 10 antibiotics and showed similar patterns.