COVID

An expert answers questions about when and how to use the tests

Deaths of parents and other terrible experiences have hurt hundreds of thousands, so new initiatives are trying to help families in pain

The rapid spread of new variants such as Omicron offers clues to how SARS-CoV-2 is adapting and how the pandemic will play out over the next several months

The rapid spread of new variants such as Omicron offers clues to how SARS-CoV-2 is adapting and how the pandemic will play out over the next several months

The numerous changes in the coronavirus’s spike protein could have arisen in an isolated population or an immunocompromised person—or animals

Vaccination is likely to prevent many more COVID cases than it is to cause a rare and nonfatal heart side effect in five- to 11-year-olds

On World AIDS Day, why global COVID deaths are a fraction of global AIDS deaths

A drug made by Merck and Ridgeback Biotherapeutics—which an FDA panel recently greenlit—and one made by Pfizer work in different ways, but both prevent the virus from replicating

Researchers are racing to determine whether a fast-spreading coronavirus variant poses a threat to COVID vaccines’ effectiveness

A mechanism known as “original antigenic sin” protects some people from flu. Whether it helps immune reactions to coronaviruses is still unclear

From conjunctivitis to vertigo, coronavirus infections can affect disparate senses

A new delivery method for certain vaccines could make the lifesaving treatments more effective and accessible