We explored the secondary attack rate in different types of contact with persons presymptomatic for coronavirus disease (COVID-19). Close contacts who lived with or had frequent contact with an index case-patient had a higher risk for COVID-19. Our findings provide population-based evidence for transmission from persons with presymptomatic COVID-19 infections.
Keywords: 2019 novel coronavirus disease; COVID-19; China; SARS; SARS-CoV-2; coronavirus disease; coronavirus secondary transmission; presymptomatic; respiratory infections; secondary attack rate; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.