Other "Staphylococcus" bacteria can cause infections, including "Staphylococcus epidermidis" and "Staphylococcus saprophyticus". "Staphylococcus epidermidis" is a bacterium that is normally on the skin. If someone has a disease that makes his or her immune system work badly, this bacterium might give him or her an infection. "Staphylococcus saprophyticus" can cause urinary tract infections in women.