Around 43,000 people in England may have been wrongly told their Covid-19 test was negative because of errors at a lab.
Testing at the Wolverhampton laboratory has been suspended following an investigation by NHS Test and Trace.
It is now contacting those affected, mainly in the south west region, to ask them to take another Covid test.
Concerns were raised when people had positive lateral flow tests but negative PCR results from the lab.
Source: BBC News, 15 October 2021