People Are Querying Covid Test Accuracy For The New XBB Subvariant

By now, with the many waves of Covid-19 infections we’ve endured, you may know someone who’s tested negative on an at-home lateral flow Covid test only to test positive in a doctor’s office.

This phenomenon – which isn’t uncommon, anecdotally speaking – has stumped experts. Could the tests be getting less precise as the coronavirus evolves? Or are there problems in the ways or frequency with which people test themselves?

Scientifically speaking, the tests generally are fine. Molecular biologists, the people who investigate diagnostic tests, don’t expect XBB — the latest variant creating a storm of infections across the US and beyond— to have much of an effect on the accuracy of our at-home rapid tests.

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