STX2 and Bovine mastitis: Study in Turkey indicated that genes encoding Shiga toxins 1 and 2 (stx1 and stx2), intimin (eaeA), heat-stable enterotoxin a (Sta), and F5 (K99), F41, and F17 fimbriae were the most prevalent virulence factors which were isolated from clinical bovine mastitis cases [9].