Covid-19: How many variants are there, and what do we know about them? – The BMJ   Commentary on Twitter Eight notable variants of SARS-CoV-2 have been found since September 2020. @emahase_ reviews the line-up so far https://t.co/jmzfnbudoL Watch this video showing how the variants have spread around the globe: pic.twitter.com/KwBl6B48Dy — The BMJ (@bmj_latest) […]

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