Game changer: SARS-CoV-2 variants are gradually replacing the original strains

More contagious and sometimes resistant to antibodies, some SARS-CoV-2 variants are gradually replacing the original strains. While this virus, which appeared recently in humans, is adapting to its new host, scientists from numerous disciplines are relentlessly monitoring its evolution.

Although vaccination campaigns were meant to accelerate the end of the epidemic, the appearance of different variants of the Covid-19 virus is raising fears that it might resume with even greater intensity. Although this is bad timing, the emergence of mutations remains a natural phenomenon that is increasingly likely to occur as an epidemic spreads. What then makes the UK, South African and Brazilian variants distinct from the original strains?

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