281Regional Changes in Methicillin-Resistant Staphylococcus aureus in Purulent Skin and Soft Tissue Infections among Patients Presenting to Canadian Emergency Departments. (December 2014) - Ng, Wil; Borgundvaag, Bjug; Rowe, Brian H.; Willey, Barbara; Porter, Vanessa; Simor, Andrew E.; Mcgeer, Allison; Loftus, Michelle; Katz, Kevin