People can test positive and are most contagious before they show symptoms. As opposed to influenza where people with symptoms are most contagious. The delay in

People can test positive and are most contagious before they show symptoms. As opposed to influenza where people with symptoms are most contagious. The delay in the onset of symptoms is why this is a very difficult virus to contain. Further, the accuracy of our tests is questionable and hopefully improving. Finally, viral shedding has been seen up to 35+ days since symptom onset. Meaning if they showed symptoms a month ago, they may still test positive. https://www.aarp.org/health/conditions-treatments/info-2020/onset-of-covid-19-symptoms.html https://www.aarp.org/health/conditions-treatments/info-2020/...