COVID

Even Though Mass Testing For COVID Isn’t Always Accurate, It Could Still Be Useful – Here’s Why

By Jonathan Pugh

This article was originally published here by the Conversation, on 22nd Dec 2020

 

The mass testing of asymptomatic people for COVID-19 in the UK was thrown into question by a recent study. In a pilot in Liverpool, over half the cases weren’t picked up, leading some to question whether using tests that perform poorly is the best use of resources.

The tests involved in this study were antigen tests. These see whether someone is infected with SARS-CoV-2 by identifying structures on the outside of the virus, known as antigens, using antibodies. If the coronavirus is present in a sample, the antibodies in the test bind with the virus’s antigens and highlight an infection.

Antigen tests are cheap and provide results quickly. However, they are not always accurate. But what do we mean when we say that a test is inaccurate? And is it really the case that “an unreliable test is worse than no test”? Continue reading

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