Canada has changed its guidelines on mixing doses of Covid-19 vaccines, the country's health agency said Tuesday, and Canadians may get a different type of vaccine for their second shot.
원문출처 : https://www.cnn.com/2021/06/01/americas/canada-mixing-coronavirus-vaccines/index.html
원문출처 : https://www.cnn.com/2021/06/01/americas/canada-mixing-coronavirus-vaccines/index.html