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VIDEO: How do virus tests like PCR actually work?

A new virus emerges and spreads like wildfire. In order to contain it, researchers must first collect data about who’s been infected. Two main viral testing techniques are critical: one tells you if you have the virus and the other shows if you’ve already had it.
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So, how exactly do these tests work? Cella Wright explores the science of PCR tests and immunoassays.

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