Abstract
Staphylococcus epidermidis and Staphylococcus haemolyticus, belonging to coagulase-negative staphylococcus group (CoNS), are the species of Staphylococcus genus most isolated from hospital bacteremias. They live symbiotically with their host, and can cause opportunist infections, mainly in immunocompromised individuals. The extensive and indiscriminate use of antibiotics is selecting resi…