Evidence for Limited Early Spread of COVID-19 Within the United States, January–February 2020 Published on 2020-06-052022-10-30 Journal: Morbidity and Mortality Weekly Report [키워드] COVID-19 Limited The United States [Category] COVID-19, SARS, PMC URL [DOI] 10.15585/mmwr.mm6922e1 [Article Type] Full Report [Source] PMC All Keywords 【제목키워드】 COVID-19, The United States, Limited,