WINNIPEG — Manitoba Health and Seniors Care says a mother and her three-year-old were each mistakenly given an adult dose of the Pfizer-BioNTech COVID-19 vaccine instead of a flu shot. The department says in a statement that the error happened on Nov. 24 in the Prairie Mountain Health region, which is in western Manitoba. Manitoba Health says the mother was informed about what happened and given information about the risks, which it adds are...