Mice exposed to heat wave temperatures ate less and showed weakened immune responses to the virus.

Numerous experimental vaccines that aim to provide multi-season protection are in human studies.

Despite the treatment being given for only six weeks, the positive effects lasted for a year.

Vaccination reduced the risk of death by two-thirds for children with no other health problems.  

They may be a prospective source for an influenza pandemic, researchers warn.  

The antimicrobial drug neomycin protects mice from some viral infections, complicating the picture of the relationship between antibiotics and susceptibility to viruses.

One dose of the medication, called Xofluza, cripples influenza by interfering with an enzyme critical for viral replication.  

Infants whose moms received the shots when they were pregnant were no more at risk of dying or being hospitalized than other babies. 

The vaccine shows better-than-expected effectiveness against the most common and most virulent strain of influenza in children under 9 years old.