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Methicillin-Resistant Staphylococcus Aureus (MRSA) - Overview. Methicillin-resistant Staphylococcus aureus (MRSA) is a type of staphylococcus or  staph  bacterium that is resistant to many antibiotics.Staph bacteria, like other kinds of bacteria, normally live on your skin and in your nose, usually without causing problems.ethicillin-Resistant Staphylococcus Aureus (MRSA) - Overview. Methicillin-resistant Staphylococcus aureus (MRSA) is a type of staphylococcus or  staph  bacterium that is resistant to many antibiotics.
In this article. Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterium that causes infections in different parts of the body. It's tougher to treat than most strains of staphylococcus aureus -- or staph -- because it's resistant to some commonly used antibiotics.ess often, staph can cause serious problems like infected wounds or pneumonia. Staph can usually be treated with antibiotics. But over the decades, some strains of staph -- like MRSA -- have become resistant to antibiotics that once destroyed it.