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The Brazilian Covid variant has been found in 15 countries that are not banned for international travel by the UK's red list.
UK residents must quarantine in a hotel for at least ten days after returning from 33 countries where variants of concern are known to exist.
But the Brazilian variant — known as P.1 — has also been found in the US, Canada, France, Germany, Spain, Japan, Mexico, India, Italy and South Korea, none of which are on Britain's 'red list'.
A list compiled by the World Health Organization also included further reports of the variant being found in China, Croatia, Ireland, Sweden, Switzerland and Turkey.