MRSA is a bacterium that is resistant to most antibiotics. MRSA is an abbreviation for 'methicillin-resistant Staphylococcus aureus'.
...the problem of MRSA in hospitals.
MRSA in British English
abbreviation for
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
MRSA in American English
(ˈmɜrsə)
a strain of staphylococcus particularly resistant to antibiotics