(NPR) Coronavirus Was In U.S. Weeks Earlier Than Previously Known, Study Says

Coronavirus Was In U.S. Weeks Earlier Than Previously Known, Study Says

A new study that analyzed blood donations from December 2019 to early January helped show that the coronavirus infected people in the U.S. earlier than previously thought.



Yana Paskova/Getty Images


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Yana Paskova/Getty Images

Coronavirus Updates

Coronavirus Was In U.S. Weeks Earlier Than Previously Known, Study Says

The discovery, uncovered after analyzing blood donations from nine states, strengthens evidence that COVID-19 was quietly spreading around the world before health officials were aware.