People who exercise for 90 minutes immediately after receiving a flu or COVID-19 vaccine may get an extra immunity boost, researchers report.

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

After a mild flu season last year thanks to steps to prevent COVID's spread, experts worry it could come back bigger this year. Here's what to know.

A new experimental nanoparticle-based vaccine that has proven effective for flu, is also being tested for COVID-19 and studied as an HIV vaccine.

The particles that let the flu virus infect people could be key to ridding the world of the virus forever, according to researchers.

Cracking a smile or grimacing can make injections hurt less, researchers say. They found pain went down by as much as 40%.

A new therapy that targets flu infections could work on other viral infections including, potentially, COVID-19, researchers report.

An expert sheds light on the process of creating a COVID-19 vaccine and how it may be different from other common vaccines like the flu shot.

How can you tell if you have a cold, the flu, or COVID-19 when some symptoms overlap? An expert breaks it down, including when to call the doctor.

An expert breaks down what you need to know about the potential for a "twindemic" of flu and COVID-19 this year, including how to keep yourself safe.