The Pfizer-BioNTech COVID vaccine has been a moderately effective tool for preventing spread and reducing the severity of infection in kids and teens.

There was hope that pre-existing immunity to the common cold could protect against COVID, but new evidence suggests that sometimes the opposite can happen.

A deadly virus affects seals on the North Atlantic coasts of North America and Europe very differently. New research clarifies why.

In humans the pandemic is showing signs of ebbing. In deer and other animals, however, SARS-CoV-2 infections appear widespread, researchers say.

New research suggests that customizing booster shots based on genes could be a way to make them more effective for more people.

COVID-19 may transition from pandemic to endemic, but when and how will we get there? One expert cautions against "declaring that we're done."

New details about the structure of the HIV virus may help in the design and development of a vaccine that can protect against AIDS.

New research shows controlling ventilation, filtration, and humidity can cut the spread of viruses. But getting the right combination is key.

Identifying "fence-sitters," adults ambivalent about vaccines, and using community members to relay reliable information could ease vaccine hesitancy.

New research is the first to show how the Epstein-Barr virus, a common type of herpes virus, triggers multiple sclerosis.