#COVID19 #vaccine [ad_1] Dr. Caroline Quach-Thanh, chair of the National Advisory Committee on Immunization, discusses how vulnerable populations will be prioritized when a  COVID-19 vaccine rolls out. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX Find CBC News on