Canada’s National Advisory Committee on Immunization says there’s enough evidence showing the AstraZeneca COVID-19 vaccine is both safe and effective for seniors. That reverses a recommendation March 1st, when the panel of vaccine experts said AstraZeneca hadn’t included enough people over the age of 65 in its clinical trials.The committee still says if there is a choice, the mRNA vaccines like Pfizer and Moderna should be prioritized for use on seniors.