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

Among 3410 close contacts of 391 people infected with SARS-CoV-2, 127 (3.7%) were secondarily infected – 8 asymptomatic, 20 mild, 87 moderate and 12 severe/critical. Secondary attack rate was highest for household contacts, and increased with the severity of index cases.


Annals of Internal Medicine