The Globe and Mail Shawn Harmon Published March 11, 2021 Bookmark Please log in to listen to this story. Also available in French and Mandarin. Log In Create Free Account Getting audio file ... This translation has been automatically generated and has not been verified for accuracy. Full Disclaimer Shawn Harmon is a Research Associate at the IWK Health Centre, Part-Time Faculty at the Schulich School of Law, Dalhousie University, and Honorary Fellow at the University of Edinburgh As the most ambitious vaccination program in Canadian history ramps up, there will be occasions when individuals will experience an ‘adverse event following immunization’ (AEFI). The World Health Organization defines an AEFI as any untoward medical occurrence which follows immunization and which does not necessarily have a causal relationship with the usage of the vaccine. Predictable non-serious AEFIs include redness, soreness or itching at the injection site, short-term poor appetite, light-headedness, or mild fever. It is the rare ( 1/10,000 to 1/1,000) and very rare ( 1/10,000)