When it comes to infectious diseases, "exposure" means coming into contact with a virus or bacteria. Infection happens when someone is exposed and actually becomes sick from the exposure.

When does a person with COVID-19 start being contagious?

Researchers estimate that people who get infected with the coronavirus can spread it to others 2 to 3 days before symptoms start and are most contagious 1 to 2 days before they feel sick.

Can I spread COVID-19 if I have no symptoms?

Some people with COVID-19 have no signs and symptoms but can still spread the virus to others.