Medical Dictionary

MRSA

noun \ˌem-ˌär-ˌes-ˈā, ˈmər-sə\

Medical Definition of MRSA

:  any of several bacterial strains of the genus Staphylococcus (S. aureus) that are resistant to beta-lactam antibiotics (as methicillin and nafcillin) and that are typically benign colonizers of the skin and mucous membranes (as of the nostrils) but may cause severe infections (as by entrance through a surgical wound) especially in immunocompromised individuals

Origin of MRSA

methicillin-resistant Staphylococcus aureus

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