positive test

There is a lot of information about coronavirus vaccines out there, and some of it seems vague or contradictory. We talked to experts to help answer some of the most common and confusing questions.

These days the world of at-home testing for COVID-19 is confusing. How often do I need to test to see if I'm really positive — or negative? Does a faint line mean I'm less contagious?

The FDA issued revised guidance about how often to test after exposure to someone with COVID or after symptoms occur. It's not exactly the same as what the CDC says. What's the best way to proceed?