What's different about the coronavirus 'variants of concern' flagged by WHO

​The seemingly more transmissible variants of the coronavirus first discovered in Britain, South Africa and Brazil are called "variants of concern" by the World Health Organization. Here's a look at what's driving the concern and calls for more precautions in Canada. https://www.cbc.ca/news/health/coronavirus-variants-concern-canada-1.5879223?cmp=rss #news/health