Difference in virulence between Staphylococcus aureus isolates causing gangrenous mastitis versus subclinical mastitis in a dairy sheep flock Eric Vautor, Joshua Cockfield, Caroline Le Marechal, Yves Le Loir, Marlène Chevalier, D. Ashley Robinson, Richard Thiery and Jodi LindsayVet. Res., 40 6 (2009) 56DOI: https://doi.org/10.1051/vetres/2009039