At the surface, the immune response to a flu virus is simple. Some cells recognize the pathogen and send a signal to the ...

New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

Flu Shot in Pregnancy Tied to Fewer Infections in Young Infants — Protection appeared greatest when vaccination occurred in the second or third trimesters ...

The Trump administration’s vaccine advisers took up an old flu-shot debate: whether it’s time to wipe out the last small fraction of those vaccines that contain a controversial preservative ...