MRSA stands for methicillin-resistant Staphylococcus aureus, a type of bacteria that is resistant to several antibiotics.
In the community (where you live, work, shop, and go to school), MRSA most often causes skin infections. In some cases, it causes pneumonia (lung infection) and other infections. If left untreated, MRSA infections can become severe and cause sepsis—the body’s extreme response to an infection.
In places such as a hospital or nursing home, MRSA can cause severe problems such as bloodstream infections, pneumonia, or surgical site infections.