The Covid-19 virus infected people in five U.S. states well before the first cases were reported, a study found
Scientists analyzing blood samples taken for a National Institutes of Health research program identified seven people in states from Mississippi to Wisconsin to Pennsylvania who were infected with the new virus days or weeks before the first cases were confirmed in their areas. At least a couple had mild symptoms.Two samples, one taken from a person from Illinois and another from a person from Massachusetts, date to Jan. 7 and 8, 2020, respectively, the researchers said.
The number of Covid-19 cases found in the frozen, stored blood samples is small, suggesting the early cases in the U.S. were sporadic.
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