Comparative analysis of agr groups and virulence genes among subclinical and clinical mastitis Staphylococcus aureus isolates from sheep flocks - Almeida, Lara Mendes de; Almeida, Mayra Zilta P. R. B; Mendonça, Carla Lopes de; Mamizuka, Elsa Masae (Brazilian Journal of Microbiology, 2013)