Methicillin-resistant Staphylococcus aureus.
Staphylococcus aureus is a bacteria; methicillin is a drug. So basically methicillin-resistant Staphylococcus aureus is a type of bacteria which we can’t kill using the common antibiotic drugs which you might get from your doctor, like penicillin.
Building on what Paul said, that’s the reason MRSA goes around a lot in hospitals – lots of antibiotics (so lots of chances for bacteria to become resistant) and lots of sick/weakened people (so a big playground for the bacteria once they’ve become resistant).
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