Staphylococcus aureus (Staph) is a very common germ that about one out of every three people has on their skin or in their nose. It doesn’t cause problems for most people, but can sometimes cause serious skin, wound, or blood infections, or pneumonia.
These infections are typically treated with antibiotics, but some Staph strains, such as methicillin-resistant Staphylococcus aureus (MRSA), are resistant to antibiotics and are therefore more difficult to treat.