Staphylococcal (staph) infections are communicable conditions caused by certain bacteria and generally characterized by the formation of abscesses. They are the leading cause of infections originating in hospitals in the United States.

Classified since the early 20th century as among the deadliest of all disease-causing organisms, staph exists on the skin or inside the nostrils of 20% to 30% of healthy people. The bacteria are sometimes found in breast tissue, the mouth, and the genital, urinary, and upper respiratory tracts.

Although staph bacteria are usually harmless, when injury or a break in the skin enables the organisms to invade the body and overcome the body's natural defenses, consequences can range from minor discomfort to death. Infection is most apt to occur in:

• Newborns
• Women who are breastfeeding
• Individuals whose immune systems have been impaired by radiation chemotherapy, or medication
• Intravenous drug users
• Those with surgical incisions, skin disorders...