This study will focus on the epidemiology of patients with skin or soft tissue infections presenting to the adult emergency departments (EDs) at the London Health Sciences Centre (LHSC) and the Urgent Care Center at St. Joseph's Health Centre (SJHC). By using a comparison group of non CA-MRSA infections, the proportion of CA-MRSA with relation to the total MRSA and methicillin sensitive Staphylococcus aureus (MSSA) in the region will be investigated. The study will also investigate the risk factors in the CA-MRSA population including: demographics, housing history, contact with the health care system, past CA-MRSA infection, asymptomatic CA-MRSA colonization, colonization/infection of close contacts, involvement in contact sports/team sports, hygienic body shaving, chronic skin disorders, recurrent/recent antibiotic use, IV drug use, contact with incarcerated individuals, and chronic disease.