What is the incubation period of the SARS-CoV-2 virus (Covid-19)

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Officially the incubation period for the COVID-19 virus (SARS-CoV-2 ) is in the range of 2-14 days. However Chinese authorities have reported a case with an incubation period of 27 days in the  Hubei Province local government on Feb. 2 2020. In a JAMA study cases have been reported with an incubation period of 19 days. (Source: https://www.worldometers.info/coronavirus/coronavirus-incubation-period). A very long incubation period might also reflect double exposure

Mean incubation period observed: 

3.0 days (0 – 24 days range, study based on 1,324 cases)

5.2 days (4.1 – 7.0 days range, based on 425 cases).

Mean incubation period observed in travelers from Wuhan

6.4 days (range from 2.1 to 11.1 days).