Senior government officials have raised “urgent” concerns about the mass expansion of rapid coronavirus testing, estimating that as few as 2% to 10% of positive results may be accurate in places with low Covid rates, such as London.
…However, leaked emails seen by the Guardian show that senior officials are now considering scaling back the widespread testing of people without symptoms, due to a growing number of false positives.
…On 9 April, the day everyone in England was able to order twice-weekly lateral flow device (LFD) tests, Dyson wrote: “As of today, someone who gets a positive LFD result in (say) London has at best a 25% chance of it being a true positive, but if it is a self-reported test potentially as low as 10% (on an optimistic assumption about specificity) or as low as 2% (on a more pessimistic assumption).”
Birmingham University
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Nine out a 10 people in England live in areas that have not seen a Covid-19 case in a month and new lockdowns are not needed, an expert has said.
Professor John Clancy, from Birmingham University, has warned that fears of another shutdown are based on ‘dodgy data.’
Writing in a blog, he said: ”91 per cent of England (that’s 51million people) live in neighbourhoods where there hasn’t been a recorded Covid-19 case in the last 4 weeks.’
He added: ‘So-called ‘spikes’ are occurring here, there, and everywhere up and down the country because new testing regimes are causing them either with false positives, picking up residual infections or (usually more likely) suddenly increased testing in specific areas.’