NHS Test and Trace suspends Covid testing provided by a private laboratory in Wolverhampton amid fears up to 43,000 people were given the wrong result.
Dr Jenny Harries, the head of NHS Test and Trace, says it is not yet clear how or why the laboratory might have given incorrect results.
Harries adds there will be a "serious incident investigation" to ensure there are not problems at other testing laboratories.
Earlier, a mass testing site in Berkshire asked people who recently got a negative result to book another test.
It comes after reports that some people received negative PCR tests after testing positive using lateral flow devices.
But health officials say the problem is "an isolated incident attributed to one laboratory" and that they are investigating the cause.
Separately, travellers returning to England will be able to take cheaper lateral flow tests from 24 October.
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