Coronavirus: are false positive Covid-19 tests skewing infection rate figures?

Mass testing combined with a low level of genuine cases can lead to misleading results

Coronavirus testing lab
Mass testing combined with a low level of genuine cases can lead to misleading results
(Image credit: Ed Jones/Getty)

As concern grows about new outbreaks of Covid-19 across several European countries, scientists - and hopeful holidaymakers - are poring over coronavirus test data.

But even though the tests used by the NHS and other European health services are considered highly reliable by international standards, “it’s surprisingly hard to determine how accurate a coronavirus test is”, says Maureen Ferran, associate professor of biology at New York’s Rochester Institute of Technology, in an article on The Conversation.

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Holden Frith is The Week’s digital director. He also makes regular appearances on “The Week Unwrapped”, speaking about subjects as diverse as vaccine development and bionic bomb-sniffing locusts. He joined The Week in 2013, spending five years editing the magazine’s website. Before that, he was deputy digital editor at The Sunday Times. He has also been TheTimes.co.uk’s technology editor and the launch editor of Wired magazine’s UK website. Holden has worked in journalism for nearly two decades, having started his professional career while completing an English literature degree at Cambridge University. He followed that with a master’s degree in journalism from Northwestern University in Chicago. A keen photographer, he also writes travel features whenever he gets the chance.