The government says sequencing of positive PCR tests for travellers is important.
Read moreBy Anthony Reuben and Caroline Davies
BBC Reality Check
A series of major wildfires across the world has hit the headlines - how do they compare to previous years?
A series of major wildfires across the world has hit the headlines - how do they compare to previous years?
Posts claiming Covid vaccines cause miscarriages are not supported by scientific evidence.
Iranian officials have warned of historic drought while experts blame years of poor water management.
Holding the world's biggest sporting event comes with a hefty price tag
Debunking claims shared widely on social media about cremations in the UK and US vaccine statistics.
A renewed surge in fighting has made it ever more difficult for aid to reach areas in desperate need.
What's the row about virus research in China between a prominent Republican and Dr Anthony Fauci?
A series of major wildfires across the world has hit the headlines - how do they compare to previous years?
Posts claiming Covid vaccines cause miscarriages are not supported by scientific evidence.
Iranian officials have warned of historic drought while experts blame years of poor water management.
Holding the world's biggest sporting event comes with a hefty price tag
Debunking claims shared widely on social media about cremations in the UK and US vaccine statistics.
A renewed surge in fighting has made it ever more difficult for aid to reach areas in desperate need.
What's the row about virus research in China between a prominent Republican and Dr Anthony Fauci?
Posts claiming Covid vaccines cause miscarriages are not supported by scientific evidence.
Iranian officials have warned of historic drought while experts blame years of poor water management.
Holding the world's biggest sporting event comes with a hefty price tag
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