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The rule applies to all travellers visiting the UK or returning from a holiday, regardless of vaccination status, and will come into force from 4am on Tuesday 7 December.
Tests must be taken a maximum of 48 hours before the departure time.
Nigeria is also being added to the travel red list – joining several southern African nations which were added after the Omicron variant was first detected late last month.
The UK Health Security Agency has revealed that over half of people who have the new Omicron variant are double vaccinated.
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