The error at the Wolverhampton lab meant that around 39,000 PCR tests were reported as negative when they should have been positive between September 2 and October 12 2021.
The Immensa Health Clinic in Woverhampton reported that just 0.2 per cent of Covid tests from people in Sheffield were positive, compared to an expected five to eight per cent.
Immensa s lab in Wolverhampton was suspended after 43,000 Covid-infected people were wrongly told they didn t have the virus. The firm is still doing travel PCR analysis.
Expert says privately contracted PCR testing must be reined in politics.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from politics.co.uk Daily Mail and Mail on Sunday newspapers.
The UK Health Security Agency revealed today that mistakes at a disgraced Covid testing lab - Immensa Health Clinic in Wolverhampton -began six days earlier than originally thought.