How long does someone stay infectious with COVID?
An infected person can transmit the virus up to two days before they experience symptoms, as well as while they have symptoms.
Also adults with mild-to-moderate COVID-19 can remain infectious for 10 days after symptoms begin.
Most adults with severe-to-critical illness (or immune suppression, e.g. patients with a transplant on drugs that suppress the immune system) will remain infectious for up to 4 weeks after symptoms begin.
