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.
2 Staph bacteria have developed a resistance to penicillin-related antibiotics, including methicillin-these resistant bacteria are called methicillin-resistant staphylococcus aureus, or MRSA.  Staphylococcus aureus  (S. aureus) refers to an often harmful bacterium, commonly found in the nose and skin of humans.