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.

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

(Image credit: Yana Paskova/Getty Images)

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