Influenza A Subtypes and the Species Affected
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 18 different hemagglutinin subtypes and 11 different neuraminidase subtypes. All known subtypes of influenza A viruses have been found among birds, except subtype H17N10 and H18N11 which have only been found in bats. Below is a table showing the different hemagglutinin and neuraminidase subtypes and the species in which they have been detected.
Hemagglutinin
Subtype | People | Poultry | swine | Bats / Other |
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H1 | people icon | ![]() |
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H2 | people icon | ![]() |
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H3 | people icon | ![]() |
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Other Animals |
H4 | ![]() |
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Other Animals | |
H5 | people icon | ![]() |
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H6 | people icon | ![]() |
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H7 | people icon | ![]() |
Other Animals | |
H8 | ![]() |
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H9 | people icon | ![]() |
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H10 | people icon | ![]() |
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H11 | ![]() |
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H12 | ![]() |
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H13 | ![]() |
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H14 | ![]() |
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H15 | ![]() |
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H16 | ![]() |
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H17 | ![]() |
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H18 | ![]() |
Neuraminidase
Subtype | People | Poultry | Pigs | Bats / Other |
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N1 | people icon | ![]() |
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N2 | people icon | ![]() |
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N3 | ![]() |
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N4 | ![]() |
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N5 | ![]() |
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N6 | people icon | ![]() |
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N7 | people icon | ![]() |
Other Animals | |
N8 | people icon | ![]() |
Other Animals | |
N9 | people icon | ![]() |
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N10 | ![]() |
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N11 | ![]() |
Page last reviewed: September 27, 2018