Staphylococci are amongst the most common skin bacteria. Most are part of the skin's natural flora but given a chance they can become pathogenic, causing superficial or deep skin infection. Certain strains of Staphylococci are more virulent that others. The most common clinical sign of disease is a local pus-producing skin infection following a scratch or skin puncture. Hair follicles may be inflamed (folliculitis). Deeper infection causes pus-filled boils or carbuncles. These can seed the bacteria into the blood stream. Staphylococci may also cause ear and urinary tract infection. We use antibiotics from the cephalosporin group as our treatment of choice.