Coronavirus had been infecting people in the US even before China reported its first cases on December 31, 2019, research by the US Centers for Disease Control and Prevention (CDC) and the American Red Cross has revealed.
American medics officially registered their first Covid-19 patient on January 19, 2020, but the findings in a paper published in the journal Clinical Infectious Diseases suggest the virus may have been circulating in the US prior to that.
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