Among the pernicious features of COVID-19, the incubation period is longer than many other viral respiratory infections, including influenza, respiratory syncytial virus, and rhinovirus.

Can’t see this article?

This may be due to a conflict with your ad blocking or security software. Add japantimes.co.jp and piano.io to your whitelist. If this does not resolve the issue or you are unable to whitelist the domains, see this support page. We humbly apologize for the inconvenience. In an age of misinformation and information overload, quality journalism is more important than ever. By signing up, you can help us get history right. REGISTER NOW