The current recommendations for antibiotic treatment of unknown S. aureus infection are based on clinical judgment, and therefore an understanding of regional incidence and susceptibility of CA-MRSA are essential for empiric treatment. Through the microbiological analysis of the cases, laboratory parameters and antibiotic susceptibility of CA-MRSA presenting to LHSC will be established. As well, the clinical characteristics of these patients will be documented to aid clinicians in recognizing patients presenting with CA-MRSA.