- methicillin-resistant Staphylococcus aureus, a bacterium that is highly resistant to methicillin, penicillin, and certain other antibiotics, and may cause infections of the skin, blood, lungs, etc.: MRSA infections in hospitals and healthcare facilities.
- a staph infection caused by these bacteria: the threat of MRSA among athletes.
- methicillin-resistant Staphylococcus aureus : a bacterium that enters the skin through open wounds to cause septicaemia and is extremely resistant to most antibiotics. It has been responsible for outbreaks of untreatable infections among patients in hospitals
