One in five people with coronavirus could test negative, head of Test and Trace programme tells MPs
The tests involve a nose and throat swab which is then used to look for the virus's genetic material. It detects active coronavirus infection, so cannot say if someone has recovered from Covid-19.
She added that the issue of why those with a negative result were not re-tested was"a medical/science question", and it was her job"to take Sage and chief medical officers' guidance". Prof Nicola Stonehouse, a virologist at the University of Leeds, said people needed to be aware that one test wasn't"good enough".Currently, a negative test clears people to return to work provided they don't have symptoms, and means contact tracing isn't triggered.programme the"best guess" was about 70 in every 100 people who have coronavirus would be picked up by the testing programme.
It also needs people to come forward for testing. Surveys suggest there are around 8,000 new infections a day in the community, but the testing system is picking up less than 2,000 of them - and that includes those diagnosed in care homes and hospitals.
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