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Why were Covid test errors at Wolverhampton lab not stopped sooner?
For almost a month last year a coronavirus testing lab in Wolverhampton sent out thousands of incorrect results telling people they were clear when in fact they were infected. Immensa Labs is estimated to have sent out about 43,000 "false negative" results to people right across the south west of England. David Gregory-Kumar has been trying to find out what went wrong at Immensa and what the impact of this mistake actually was.
