Seasonal Influenza (Flu)

Types of Influenza Viruses

There are three types of influenza viruses: A, B and C. Human influenza A and B viruses cause seasonal epidemics of disease almost every winter in the United States. The emergence of a new and very different influenza virus to infect people can cause an influenza pandemic. Influenza type C infections cause a mild respiratory illness and are not thought to cause epidemics.

Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: the hemagglutinin (H) and the neuraminidase (N). There are 16 different hemagglutinin subtypes and 9 different neuraminidase subtypes. Influenza A viruses can be further broken down into different strains. Current subtypes of influenza A viruses found in people are influenza A (H1N1) and influenza A (H3N2) viruses. In the spring of 2009, a new influenza A (H1N1) virus emerged to cause illness in people. This virus was very different from regular human influenza A (H1N1) viruses and the new virus has caused an influenza pandemic.

Influenza B viruses are not divided into subtypes. Influenza B viruses also can be further broken down into different strains.

For information about 2009 H1N1 flu, visit http://www.cdc.gov/h1n1flu/

Regular influenza A (H1N1), A (H3N2), and influenza B viruses are included in each year's seasonal influenza vaccine. Getting a flu vaccine can protect against flu viruses that are the same or related to the viruses in the vaccine. The seasonal flu vaccine does not protect against influenza C viruses and this year’s seasonal vaccine will not protect against the 2009 H1N1 virus. This year there is also a 2009 H1N1 vaccine.