The UK imposes travel restrictions on six African countries over a new highly mutated Covid variant that vaccines may be less effective against.
A top health official calls it "the most significant variant" to date but no cases have yet been confirmed in the UK
"It is bad news but it's not doomsday," an Oxford scientist tells the BBC
Countries including Germany, Italy, Israel and Singapore have also restricted travel.
The agency leading Africa's response to Covid says travel bans are unlikely to reduce the spread of the new variant.
The World Health Organization will hold a special meeting later to discuss the variant.
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