By Kumanan Wilson1,2,3,4*, Steven Hawken2, Jeffrey C. Kwong5, Shelley Deeks6, Natasha S. Crowcroft6, Carl Van Walraven1,2,3, Beth K. Potter2,3, Pranesh Chakraborty4,8,Jennifer Keelan7, Michael Pluscauskas4, Doug Manuel2,3,9 Abstract: Background Live vaccines have distinct safety profiles, potentially causing systemic reactions one to 2 weeks after administration. In the province of Ontario, Canada, live MMR vaccine is currently recommended at age 12 months and 18 months. Methods Using […]