Virus May Have Arrived in U.S. in December, but Didn’t Spread Until Later

Blood samples collected in mid-December indicate possible infections more than a month before the known first case of Covid-19, but do not show community transmission.Blood samples collected in mid-December indicate possible infections more than a month before the known first case of Covid-19, but do not show community transmission.Coronavirus (2019-nCoV), Antibodies, Blood Donation, American Red Cross, Clinical Infectious Diseases (Journal), University of Washington, United StatesRead More