美国弗吉尼亚州有人去年即感染COVID19

BTX2021

Is it possible COVID19 was in the US in 2019 before we had identified it? My son was hospitalized with low oxygen, pneumonia, respiratory illness and fever in Dec 2019. Fever was 10 days. Hospital stay 4 days. Very aggressive, dry, nonproductive cough.
在我们确定COVID19之前，它是否有可能在2019年在美国发生？我儿子于2019年12月因低氧，肺炎，呼吸道疾病和发烧入院。发烧为10天。住院4天。剧烈，干燥，无症状的咳嗽。