美CDC发现到2019年12月中，已有1.4%的美国人有新冠抗体

CDC found Covid endemic in the US before December, 2019: 1.4% of all Americans had C-19 antibodies in their systems by mid-December, 2019.

• https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciaa1785/6012472?utm_source=CHINA+2020+Notification&utm_campaign=d7f25e154b-EMAIL_CAMPAIGN_2021_02_12_10_53&utm_medium=email&utm_term=0_678a4a5d7b-d7f25e154b-370321932&mc_cid=d7f25e154b&mc_eid=eaef3b8844