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The COVID-19 variants are spreading rapidly. Here's what scientists know about them — and why you need a better ...
By Bridget Balch
Biden to ban travel from South Africa, reinstate restrictions on Brazil and U.K.
By Stephanie Beasley
Pfizer vaccine only slightly less effective against key parts of South African variant, study finds
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Exclusive: Biden to impose South Africa travel ban to combat new COVID-19 variant - CDC
By David Shepardson
How scientists can 'copy and paste' Covid vaccines to work on the strain from South Africa
By Cory Stieg
Biden to impose travel restrictions on South Africa, U.K. and Brazil to mitigate new Covid strains
By Leslie Josephs & Emma Newburger