NIH study suggests coronavirus may have been in U.S. as early as December 2019 - The Washington Post
- NIH study suggests coronavirus may have been in U.S. as early as December 2019 The Washington Post
- More evidence suggests COVID-19 was in US by Christmas 2019 Yahoo News
- Covid-19 Ranged From Illinois to Massachusetts Before States Reported First Cases The Wall Street Journal
- COVID Likely Circulated In December 2019 In Massachusetts, NIH Researchers Find CBS Boston
- Five U.S. states had coronavirus infections even before first reported cases -study Reuters
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