Some cancers are actually caused by viruses that linger for long periods in the body, or cause physical damage that later turns cancerous.

Mistrust of vaccine is high among people of color in U.S. and U.K., but unequal access appears to be greater barrier in U.S., researchers say.

An influenza vaccine taken up the nose yields strong protection against different flu virus strains, a new study with mice shows.

In some cases, fever reducers and extra fluid intake can weaken the body’s response to infection.

Studies suggest seniors without the booster shot run a higher risk of infection and hospitalization from the omicron variant.

Some of the omicron variant’s unique properties – such as its ability to spread rapidly while causing milder COVID-19 infections – could usher in a new phase of the pandemic.

How easy will it be to modify COVID-19 vaccines to tackle new variants? An expert brings you up to speed on the challenges of staying one step ahead.

Harvard Medical School Professor Anthony L. Komaroff explains the difference between a scientific advance and a true breakthrough.

A new study finds no link between COVID vaccines and chances of getting pregnant, but COVID-19 infection may have a short-term effect on male fertility.

A new study finds no link between COVID vaccines and chances of getting pregnant, but COVID-19 infection may have a short-term effect on male fertility.