As COVID-19 vaccinations roll out to more and more people, health authorities are keeping a close watch for any unexpected side effects. On Tuesday, a health worker in Alaska suffered a severe allergic reaction after receiving the Pfizer-BioNTech COVID-19 vaccine. In the U.S. and Canada, vaccine recipients are supposed to hang around after the injection in case signs of an allergy appear and they need immediate treatment. COVID-19 vaccines tend to cause more of those reactions than a flu shot, about what people experience with shingles vaccinations. Health authorities have stressed that people should not jump to conclusions that there's a connection.

Source: CBC News December 17, 2020 17:47 UTC