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Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterium that causes infections in different parts of the body. It is tougher to treat than most strains of Staphylococcus aureus (see "Staphylococcus aureus") because it is resistant to an increasing number of commonly used antibiotics. MRSA infections range from harmless to life-threatening. MRSA is also colloquially called a "Superbug".