COVID-19 has infected hundreds of millions worldwide, yet some never get it. British researchers now think the reason could be a specific gene that gives the immune system advance warning to destroy viral invaders quickly. #COVID19 #Science #medical Watch The National live on YouTube starting at 9 p.m. ET Subscribe to The National: https://www.youtube.com/user/CBCTheNational?sub_confirmation=1 More from CBC News | https://www.cbc.ca/news The National is the flagship of CBC News, showcasing award-winning journalism from across Canada and around the world. Led by Chief Correspondent Adrienne Arsenault and Ian Hanomansing, our team of trusted reporters helps you make sense of the world, wherever you are.