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The Times

Why do some COVID-19 tests come back with a 'weak positive', and why does it matter?

  • Written by Sheena G. Sullivan, Epidemiologist, WHO Collaborating Centre for Reference and Research on Influenza

When we get a test result for a disease like COVID-19, we naturally expect it to be either positive or negative. But the results of these tests are not so black and white.

Polymerase chain reaction, or “PCR”, is the most common test to detect the presence or absence of SARS-CoV-2, the virus that causes COVID-19.

Recently, a “weak...

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