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How did the new strains of the coronavirus that causes Covid-19 come about?

By Dr Y.L.M.
Some of the new SARS-CoV-2 strains have altered spike proteins (pink in this 3D scan of the virus), which may make current vaccines less effective. — Reuters

The new strains are variants of the SARS-CoV-2 virus.

A new variant was first identified last December (2020).

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Coronavirus , Covid-19 , pandemic , infectious diseases , vaccine , vaccination

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