The emergence of two new variants of Sars-CoV-2, which are potentially far more infectious versions of the virus, has prompted widespread concern. This is what we know about the mutations.
As several countries prepare to ease sweeping restrictions in place to slow the coronavirus pandemic, experts say the openings should be enacted with caution to avoid a fresh wave of infection
The lack of available tests for COVID-19 means the world may not know the true extent of infection, experts say
10 months ago
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