www.fox6now.comCoronavirus was present in US earlier than initially thought: StudyA recent study found traces of the virus in blood donations collected starting in December of last year. 去年12月13日至12月16日期间收集的39份来自加利福尼亚州、俄勒冈州和华盛顿州的样本中含有新冠病毒抗体。