As flu season ramps up in the U.S., influenza is not as simple as it first appears, with several different strains in play.

First come the horseshoe crabs. Hoisting their round, tank-like shells, they trundle out of the Delaware Bay under the first ...

To round out the name, the viruses are given an H and N number to indicate a subtype. A full name might then look like this: ...

The virus in the first severe human bird flu case in the U.S. was found to have mutated. Follow Newsweek's live blog for ...

Novel vaccine platform improved protection against diverse influenza subtypes when tested in animal models and human ...

The first severe case of H5N1 bird flu was confirmed in Louisiana. Here is a map of other states that have been affected.

Northwest Naturals issued a recall of its Feline Turkey Recipe Raw Frozen Pet Food after it tested positive for bird flu.

Host genetics play a significant role in shaping immune responses to different strains in the influenza vaccine, ...

Faced with the rapid spread of avian flu through California dairies, health officials are now doing weekly testing of every ...

The findings come at a time when outbreaks of bird flu -- a different subtype of the same influenza virus -- in dairy cattle have ... Study Shows Drop in Use of Antiviral Medications in Young ...

Stanford Medicine scientists have designed a way to make our seasonal influenza vaccinations more broadly effective and ...

The findings come at a time when outbreaks of bird flu -- a different subtype of the same influenza virus -- in dairy cattle have ... Study Shows Drop in Use of Antiviral Medications in Young ...