Clinical Characteristics of Coronavirus Disease 2019 in China A study of 1,099 patients with laboratory-confirmed Covid-19 from 552 hospitals in 30 provinces,

Clinical Characteristics of Coronavirus Disease 2019 in China A study of 1,099 patients with laboratory-confirmed Covid-19 from 552 hospitals in 30 provinces, autonomous regions, and municipalities in China through January 29, 2020. "The median incubation period was 4 days (interquartile range, 2 to 7)." New England Journal of Medicine, Feb 28, 2020 https://www.nejm.org/doi/full/10.1056/NEJMoa2002032 https://www.nejm.org/doi/full/10.1056/NEJMoa2002032