All Subtypes

Influenza A virus is further divided into subtypes based on differences in the membrane proteins hemagglutinin (HA) and neuraminidase (NA), which are the most important targets for the immune system. The notation HhNn is used to refer to the subtype comprising the hth discovered Hemagglutinin (HA) protein and the nth discovered neuraminidase (NA) protein.

H1
Subtype
 
H2
Subtype
H3
Subtype
 
H4
Subtype
H5
Subtype
 
H6
Subtype
H7
Subtype
 
H8
Subtype
H9
Subtype
 
H10
Subtype
H11
Subtype
 
H12
Subtype
H13
Subtype
 
H14
Subtype
H15
Subtype
 
H16
Subtype
H17
Subtype
 
H18
Subtype
B
influenza