Epidemiological characterization of Staphylococcus aureus isolated from bovine mastitis in Porto Alegre (Rio Grande do Sul, Brazil)

ABSTRACT

One hundred strains of S. aureus isolated from bovine mastitis in Porto Alegre (Brazil) were analysed for biotype, phage pattern and ability to produce protein A. Biotype could be defined in 76 per cent of the isolates 52 per cent belonged to biotype C (bovine origin) and 24 per cent to biotype A (human origin). Phage typing performed with the human basic set (Routine Test Dilution - RTD x 100) allowed the classification of 42 per cent of samples. Low titers of protein A were detectable in 89 per cent of the strains