New variants of concern have changed the game, spreading worldwide and threatening to derail pandemic control efforts, reports The Guardian.
Increase in variants
At the end of 2020, there was a strong hope that high levels of vaccination would see humanity finally gain the upper hand over Sars-CoV-2, the virus that causes Covid-19. In an ideal scenario, the virus would then be contained at very low levels without further societal disruption or significant numbers of deaths.
But since then, new...
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