Health
Coronavirus variants: how did they evolve and what do they mean? – The Conversation UK
So-called ‘variants of concern’ have been cropping up since November.

When supplies of oxygen at hospitals in Manaus, Brazil, recently ran out, the airforce was called in for emergency evacuations while healthcare workers frantically tried to save lives with manual ventilation. For those that could not be saved, there was only morphine and a final hand-squeeze.
As calamitous as the situation is for those affected, the devastating surge in COVID cases in Manaus over the last few weeks has set alarm bells ringing ever more loudly for governments and agencies around…
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