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 |
---|---|---|---|---|
H1 | ||||
H2 | ||||
H3 | Other Animals | |||
H4 | Other Animals | |||
H5 | ||||
H6 | ||||
H7 | Other Animals | |||
H8 | ||||
H9 | ||||
H10 | ||||
H11 | ||||
H12 | ||||
H13 | ||||
H14 | ||||
H15 | ||||
H16 | ||||
H17 | ||||
H18 |
Neuraminidase
Subtype | People | Poultry | Pigs | Bats / Other |
---|---|---|---|---|
N1 | ||||
N2 | ||||
N3 | ||||
N4 | ||||
N5 | ||||
N6 | ||||
N7 | Other Animals | |||
N8 | Other Animals | |||
N9 | ||||
N10 | ||||
N11 |