Amid delays of Pfizer vaccine shipments, some Canadians who have had their first COVID-19 vaccine are apprehensive about switching to the Moderna vaccine as their second shot. But as Jamie Mauracher explains, health officials and experts insist the best shot is the first shot you can get, some Canadians have turned away from their Pfizer vaccine appointments because of the lack of supply at places where Moderna was primarily being doled out, despite national and provincial guidance to mix mRNA vaccine doses.
