Contact Settings and Risk for Transmission in 3410 Close Contacts ofPatients With COVID-19 in Guangzhou, China

Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus (SARS-CoV-2) emerged in Wuhan, Hube Province, China,in December 2019 and has since developed into a global pandemic. As of 26 May 2020, a total of 5 404 512 people have been infected, including 343 514 deaths worldwide, with 84 543 cases and 4645 deaths in China.