Study of 88 confirmed cases travelling from Wuhan with a mean incubation period of 6.4 days (95% credible interval: [5.6, 7.7]) and range of 2.1 to 11.1 days (2.5th to 97.5th percentile.)

Incubation period of 2019 novel coronavirus (2019-nCoV) infections among travellers from Wuhan, China, 20-28 January 2020.

Study of 425 laboraory-confirmed cases of novel coronavirus-infected pneumonia (NCIP) with mean incubation period of 5.2 days (95% confidence interval: [4.1, 7.0]). 

Early Transmission Dynamics in Wuhan, China, of Novel Coronavirus-Infected Pneumonia.

- Travellers from Wuhan, China
- Laboratory-confirmed cases
- Pediatric cases (children)

University of Michigan - Ann Arbor

- Wuhan, China
- Beijing, China
- Shenzhen, China
- Germany

COVID-19 Incubation Period Categorized by Geographic Locations 

Among 262 COVID-19- positive patients brought to a Beijing hospital by Beijing EMS in January and February 2020, the median incubation period was 6.7 days.

Incubation Period for COVID-19 in Beijing, China    

- Among 391 cases, the median incubation period was estimated to be 4.8 days (95% CI: 4.2-5.4).
- 5% of the cases that develop symptoms were estimated to do so by 1.6 days (95% CI: 1.3-2.0), and 95% by 14.0 days (95% CI: 12.2 – 15.9)


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