It may say spring on the calendar, but colds, flu and COVID are still making people ill. What you should know.

The H5N1 avian influenza virus is mutating to evade immune defenses in mammals following prior infection or vaccination.

New research suggests that past exposure to seasonal flu viruses may help protect people from severe illness caused by the ...

Cold germs from someone’s nose or cough can live on surfaces for hours to days, depending on many factors. Learn which ...

Early flu exposure helps immunity against H5N1 infection, with older adults having stronger antibody responses.

Here's what you need to know about bird flu. What is bird flu? The H5N1 bird flu virus has spread among a variety of bird species, including chickens, ducks, turkeys, geese, and many migratory ...