Is it possible to get the flu twice in the same season? Experts share who is more likely to get reinfected and how to stay safe during this severe flu season.

The most common complication of severe influenza is pneumonia, a lung infection that can result from the flu virus or from a secondary bacterial infection, Dr. Liu said. The flu can also trigger ...

Flu infections are the highest they’ve been in nearly 30 years, and flu deaths this winter have surpassed COVID deaths.

What is a fever and what should I do if I get one? Get answers to common questions on the condition that impacts everyone ...

Ian Randall is Newsweek's Deputy Science Editor, based in Royston, U.K. His focus is reporting on science and health. He has covered archeology, geology, and physics extensively. Ian joined ...

Experts say this is the worst flu season in the U.S. in more than a decade and cases are still trending up. Flu infections ...

Influenza A virus particles strategically adapt their shape -- to become either spheres or larger filaments -- to favor their ability to infect cells depending on environmental conditions, according ...

Cold and flu may seem alike, but knowing their key differences can prevent serious health risks. Learn how to recognize and ...

which is a subtype of influenza A. But a person infected with bird flu who isn't experiencing any symptoms is unlikely to get tested. Most people with bird flu infections typically experience mild ...

The veterinary practitioners never reported respiratory or influenza symptoms. Blood samples showed evidence of past bird flu infections in veterinarians despite the doctors never reporting ...

Influenza A virus particles strategically adapt their shape—to become either spheres or larger filaments—to favor their ...