This Journal feature begins with a case vignette highlighting a common clinical problem. Evidence supporting various strategies is then presented, followed by a review of formal guidelines, when they ...

As the United States enters its fourth month of response to the COVID-19 crisis, many are pointing to the testing of people potentially infected with the disease as the key to effective mitigation of ...

If you don't feel well, you may worry that you have COVID-19. The only way to know for sure is to take a test. At-home tests can tell whether you have the virus right now. More specialized antibody ...

Most tests for COVID-19 involve taking a swab sample from the back of the nose, throat, or both. But some tests require a blood sample. These tests aim to find out if a person has, or has ever had, an ...