is mrsa gram negative or gram positive
Also known as: Oxacillin-resistant Staphylococcus aureus (ORSA), Methicillin-resistant S. aureus (MRSA) Microbiology: MRSA is a Gram-positive coccus that is catalase positive and oxidase negative with a characteristic âbunch of grapesâ appearance under the microscope due to the activity of the coagulase enzyme.