Every influenza season has the potential to cause significant illness, increased health care utilization, hospitalization, and death. As vaccines are the best way to prevent influenza, CDC encourages vaccination against seasonal influenza as soon as vaccines become available.

Flu vaccines are designed to protect against the influenza viruses that experts predict will be the most common during the upcoming season. Three kinds of influenza viruses commonly circulate among people today: influenza A (H1N1) viruses, influenza A (H3N2) viruses, and influenza B viruses. Each year, these viruses are used to produce seasonal influenza vaccine.


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Provides flu basics, prevention, treatments, supply and distribution, news and highlights, Q&A, and free resources.  Provides information for health professionals including  key information about vaccination, infection control, prevention, treatment, and diagnosis of seasonal influenza. Also, provides information for other flu websites, including avian, swine, pandemic, etc.
Provides an overview, guidelines, checklists, planning duides, and a pandemic influenza toolkit.
Provides information for healthcare professionals, the public, and news and media.