Evidence for Limited Early Spread of COVID-19 Within the United States, January–February 2020
Evidence for Limited Early Spread of COVID-19 Within the United States, January–February 2020
From January 21 through February 23, 2020, public health agencies detected 14 U.S. cases of coronavirus disease 2019 (COVID-19), all related to travel from China (1,2). The first nontravel-related U.S. case was confirmed on February 26 in a California resident who had become ill on February 13 (3). Two days …