• Soft tissue infections in subjects who received the study medication and soft tissue infections in the study cohorts.
  

• Changes in S. aureus carriage rates (including MRSA).
  

Community-acquired MRSA infections are increasingly common in the community and in particular among certain groups of which soldiers are one. Many researchers and clinicians have postulated that one method to prevent infections is to selectively eradicate CA-MRSA in those who are colonized with the pathogen. The two main purposes of the study are: to determine if selective CA-MRSA eradication in subjects reduces infections in the CA-MRSA colonized individual; and to determine if selective CA-MRSA eradication in subjects reduces infections in the study cohort. Other information concerning CA-MRSA includes: prevalence, risk factors, and virulence data. The population will be soldiers enrolled in the combat medic training class at Ft. Sam Houston. We will enroll approximately 3000 soldiers over a two year period. After informed written consent, we will culture their anterior nares nares and administer questionnaires at the beginning and at the end of the study, following them prospectively for infections. The follow-up period will be 16 weeks. For those with CA-MRSA in their nares, they will be randomized (by cohort) to receive either 5 days of mupirocin or placebo.