Scientists investigating how influenza viruses replicate within cells "accidentally" discovered that different flu viruses ...

Researchers accidentally find that H3N2 and H1N1 flu strains use different strategies to enter cells, revealing new paths to ...

Swine flu, scientifically known as the H1N1 virus, is making headlines again as cases surge in various parts of the country, ...

Nineteen-year-old U.S. Army Pvt. David Lewis set out from Fort Dix on a 50-mile hike with his unit on Feb. 5, 1976. On that bitter cold day, he collapsed and died. Autopsy specimens unexpectedly ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. We've all heard of "the flu" but when it comes to types, subtypes and ...

Pre-existing immunity against seasonal H1N1 flu might help explain why most reported human cases of H5N1 bird flu in the U.S. have not resulted in lethal outcomes. Pre-existing immunity against ...