The normal bacteria that inhabit the human nose, also known as the nasal microbiome, may serve as a host defense mechanism against colonization and infection by Staphylococcus aureus, including methicillin resistant S. aureus (MRSA). Mupirocin is a topical antibacterial agent that may be used to clear nasal colonization with S. aureus, and reduce risk of S. aureus infection. The impact of mupirocin on the normal nasal microbiome is not known. We hypothesize that the nasal microbiome is changed by mupirocin. Our study aims to define the nasal microbiome before and after decolonization therapy with mupirocin.