Why do some people develop severe flu symptoms? A study points the finger at an unsung portion of the antibodies our immune systems generate to fend off invading pathogens.

Protection from shots like the flu vaccine typically takes a couple of weeks to kick in, so getting one now may offer ...

Experts and health authorities say that while the risk of human infection with the H5N1 strain of the avian influenza remains ...

Health officials were struggling to answer a broader and potentially worrisome question: how the infection occurred.

Did you know that the flu, and even COVID, can cause pink eye? Here's how to treat it (and avoid spreading it to others).