The growth of managed care in the U.S. was spurred by the enactment of the Health Maintenance Organization Act of 1973. While managed care techniques were pioneered by health maintenance organizations, they are now used by a variety of private health benefit programs.
1 Cellulitis is a spreading bacterial infection of the skin and tissues beneath the skin. 2  Staphylococcus and Streptococcus are the types of bacteria that are usually responsible for cellulitis, although many types of bacteria can cause the condition. Sometimes cellulitis appears in areas where the skin has broken open, such as the skin near ulcers or surgical wounds. 2  Symptoms and signs include redness, tenderness, swelling, and warmth of the affected area. 3  Cellulitis is not contagious.
Causes of an abscess. Most abscesses are caused by a bacterial infection. However, they can very occasionally develop due to an infection by viruses, fungi or parasites. When foreign organisms such as bacteria enter the body, the immune system sends white blood cells to fight the infection.nternal abscesses. Abscesses that develop inside the tummy (abdomen) are caused by an infection reaching tissue deeper within the body. This can occur as a result of: 1  an injury. 2  abdominal surgery. 3  an infection spreading from a nearby area.