美國紅十字會證實,2019年12月上旬,美國已發現新冠病毒Centers for Disease Control and Prevention scientists analyzed American Red Cross blood donations collected between Dec. 13, 2019, and Jan. 17, 2020, and found evidence of coronavirus antibodies in 106 out of 7,389 blood donations.
Of those donations. 39 samples collected from California, Washington and Oregon between Dec. 13 to Dec. 16 contained antibodies. Sixty-seven samples collected in Connecticut, Iowa, Massachusetts, Michigan, Rhode Island and Wisconsin in early January contained COVID-19 antibodies.