Why is quarantine longer if you’re *not* sick? It seems backwards, but the virus that causes COVID-19 can take up to 14 days to show up in your system. Once you have symptoms, it takes at least 10 days before you are no longer considered contagious.
If someone is sick (tests positive) that means they are already through the incubation phase and have developed the infection. 10 day isolation applies to them. Someone who is quarantined, is exposed, but is healthy. They may develop the disease between 2-14 days after exposure. If they do test positive/become sick during their quarantine then they will transition from quarantine to a 10 day isolation period as well.