The single best way to protect against the flu is to get vaccinated each year.

This page provides information about the 2011-2012 influenza season, including information about the season’s vaccines, vaccination recommendations and disease activity.

Summary of peak flu activity for the United States by month for the 1976-77 through 2010-11 flu seasons as well as information on the U.S. influenza surveillance system.

Both VIS for Live, Intranasal and Inactivated are updated.

WHO has developed this manual in order to strengthen the laboratory diagnosis and virological surveillance of influenza infection by providing standard methods for the collection, detection, isolation and characterization of viruses.