Incubation period varies, and is probably best modelled as a Gaussian function. Some cases will incubate nearly right away, and others will take more than the

Incubation period varies, and is probably best modelled as a Gaussian function. Some cases will incubate nearly right away, and others will take more than the 2-3 weeks that are often used as quarantine periods. Getting to the 95th or 99th percentile is not the same thing as getting to the 100th percentile. This is one of the reasons that a covid-zero strategy is effectively unimplementable.