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Vast Majority of Positives in Schools Likely to be False

by Toby Young
30 March 2021 8:59 PM

The “vast majority” of positives test results in schools are likely to be false, according to Jon Deeks, Professor of Biostatistics and head of the Test Evaluation Research Group at the University of Birmingham. The Telegraph has more.

Official data shows that the positive rate among secondary pupils is around 0.05 per cent, meaning there is a “high risk” that most rapid antigen tests carried out in secondary schools are false positives, according to Professor Jon Deeks.

Of the 3,867,007 lateral flow tests that were carried out on secondary pupils, just 1,805 were positive, according to the latest figures.

Health officials said that less than one in 1,000 results is a false positive overall. However, when the virus is on the wane, there is a higher likelihood of such results, as the number of true cases falls.

The positive case rate in schools equates to one in 2,142. At a rate of one in 1,000 false positives, from 3,867,007 tests you would expect 3,867 false positives.

Worth reading in full.

Stop Press: The Department for Education updated its official guidance today to say that all positive lateral flow tests taken in schools should be followed up by a confirmatory PCR test. Previously, this was only the case for tests taken by students at home.

Tags: False PositivesLateral Flow TestPCR TestSchools

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