Urgent testing for the South Africa variant of coronavirus is beginning in parts of England, after cases were found with no known links to travel or previous cases.
Two cases were found in Surrey, and testing will also take place in London, Kent, Hertfordshire and Walsall.
Previous cases in the UK were traced back to South Africa.
Cases caused by the variant were identified as part of Public Health England's random checks on tests.
The agency has been testing 5% of all positive cases, which has thrown up a number of cases that were not directly linked to people who had travelled to South Africa, prompting fears there may be community transmission of the virus.
It is not known how many cases have been identified.
The government has now ordered mobile testing units to be dispatched to a number of neighbourhoods where these cases have been identified.
In the Surrey town of Woking, home testing kits will also be sent to households.
Positive cases will be analysed to see if they are caused by the South African variant.
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Meanwhile, Prime Minister Boris Johnson has played down fears about vaccines being ineffective against the variants that are circulating.
"We are confident that all the vaccines that we are using provide a high degree of immunity and protection against all variants."
He said the vaccines could be adapted to deal with new variants if necessary.
"The fact is we are going to be living with Covid for a while to come in one way or another, I don't think it will be as bad as the last 12 months - or anything like - of course, but it's very, very important that our vaccines continue to develop and to adapt, and they will," he said.
https://news.google.com/__i/rss/rd/articles/CBMiKmh0dHBzOi8vd3d3LmJiYy5jby51ay9uZXdzL2hlYWx0aC01NTg4OTM5MdIBLmh0dHBzOi8vd3d3LmJiYy5jby51ay9uZXdzL2FtcC9oZWFsdGgtNTU4ODkzOTE?oc=5
2021-02-01 12:42:00Z
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