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Types of Influenza Virus

H1N2, Endemic in Humans, Pigs and Birds
H1N2, Endemic in Humans, Pigs and Birds

H1N2 currently poses a tremendous public health concern because it has spread to both human and pig populations. Influenza is a highly contagious respiratory infection that causes severe illness, particularly in people who are either very young or very old and people who already have an existing health condition.

H2N2, Which Caused Asian Flu in 1957
H2N2, Which Caused Asian Flu in 1957

The 1957 outbreak was caused by a virus known as influenza A subtype H2N2, or Asian flu virus. Research has indicated that this virus was a reassortant (mixed species) strain, originating from strains of avian influenza and human influenza viruses.

H5N1, Which Caused Bird Flu in 2004
H5N1, Which Caused Bird Flu in 2004

A bird-adapted strain of H5N1, called HPAI A(H5N1) for highly pathogenic avian influenza virus of type A of subtype H5N1, is the highly pathogenic causative agent of H5N1 flu, commonly known as avian influenza ("bird flu"). It is enzootic (maintained in the population) in many bird populations, especially in Southeast Asia.

image: virology.ws
H7N2
H7N2

Influenza is a contagious respiratory illness, and any influenza virus, including H7N2, has the potential to cause mild to severe illness or severe flu complications. Of the two previously known cases of human infection with H7N2 virus infection (which occurred in 2002 and 2003 [185 KB, 4 pages]), both experienced mild to moderate illness and both recovered.

source: cdc.gov
H7N7, Which has Unusual Zoonotic Potential
H7N7, Which has Unusual Zoonotic Potential

Start studying MicroBiology Influenza. Learn vocabulary, ... does the influenza virus have an envelope. yes. ... influenza with unusual zoonotic potential. H7N7.

source: quizlet.com
H9N2
H9N2

H9N2 is a subtype of the species Influenza A virus (bird flu virus). Over the years the H9N2 influenza strain caused illness in several children aged nine months to 5 years in Hong Kong with the latest occurring in December 2009.

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