H3N2

H3N2 is a subtype of the influenza A virus, which is a part of the Orthomyxoviridae family. It is a virus that causes influenza in humans. H3N2 is increasingly abundant in seasonal influenza, which kills an estimated 36,000 people in the United States each year.

History

H3N2 viruses were first identified in humans in 1968 during the Hong Kong flu pandemic. This pandemic killed an estimated one million people worldwide. Since then, H3N2 viruses have been included in the formulation of the seasonal influenza vaccine.

Characteristics

H3N2 is a subtype of the influenza A virus, and is named for the types of two proteins on the surface of the virus: hemagglutinin (H) and neuraminidase (N). The number 3 in H3N2 refers to the third of several known types of the protein hemagglutinin. The number 2 in H3N2 refers to the second of several known types of the protein neuraminidase.

Transmission

H3N2 is primarily transmitted through the air by coughs or sneezes, creating aerosols containing the virus. It can also be spread by touching surfaces contaminated by the virus and then touching the mouth or eyes.

Prevention

The best way to prevent infection with H3N2 is to receive the seasonal influenza vaccine each year. The vaccine is reformulated each year to match the strains of influenza that are most likely to be circulating in the upcoming season.

Treatment

Treatment for H3N2 is similar to that for other strains of influenza. This includes rest, fluids, and over-the-counter medications to relieve symptoms. In some cases, antiviral medications may be prescribed.

See also

• Influenza A virus subtype H1N1
• Influenza A virus subtype H1N2
• Influenza A virus subtype H2N2
• Influenza A virus subtype H5N1

H3N2 Resources
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