Freebase(0.00 / 0 votes)Rate this definition: Necrosis. Necrosis is a form of cell injury that results in the premature death of cells in living tissue. Necrosis is caused by factors external to the cell or tissue, such as infection, toxins, or trauma that result in the unregulated digestion of cell components.
Staph bacteria are commonly carried on the skin or in the nose of healthy people. MRSAâmethicillin-resistant Staphylococcus aureusâis a type of staph that is resistant to antibiotics called beta-lactams. In the past the majority of MRSA infections occurred among patients in hospitals or other health care settings.
When people are infected in a health care facility, the bacteria are usually resistant to several types of antibiotics, including all antibiotics that are related to penicillin (called beta-lactam antibiotics). Strains of bacteria that are resistant to beta-lactam antibiotics are called methicillin-resistant Staphylococcus aureus (MRSA). MRSA strains are common if infection is acquired in a health care facility, and more and more infections acquired in the community, including mild abscesses and skin infections, are caused by MRSA strains.