Well, 20-40% patients never get symptoms. Incubation period from...

Well, 20-40% patients never get symptoms. Incubation period from exposure to symptoms is anywhere from 1 day to 14 days- on average 7 days...
When one is symptomatic - the shed virus in secretions/droplets and the Gold standard PCR swab checks viral RNA to confirm diagnosis ( results in 24 hrs0

this test doesnt check RNA but body's immune response to virus... whci is after having disease for 2-3 days if not more...
so the PCR swab test will become positive first and this test will become positive after 3-5 days once body has antiboduies to the virus.