CAD and mastitis: Different species have been reported to be present in these infections, and while Staphylococcus (S.)aureus, a coagulase-positive staphylococci (CPS) species, is frequently isolated from clinical mastitis, coagulase-negative staphylococci (CNS) are more frequent in subclinical mastitis, the main type of intramammary infections in ewes [2].