Scientists in Canada and around the world are trying to solve a COVID-19 mystery - why have some people never tested positive, despite being exposed? And could they be genetically resistant to the virus?
#COVID19 #Immunity #CBCNews
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The National is CBC's flagship nightly news program, featuring the day's top stories with in-depth and original journalism, with hosts Adrienne Arsenault and Andrew Chang in Toronto, Ian Hanomansing in Vancouver and the CBC's chief political correspondent, Rosemary Barton in Ottawa.