From: Clinical review: Update of avian influenza A infections in humans
 | Influenza A | Influenza B | Influenza C |
---|---|---|---|
Genetic structure | 8 segments | 8 segments | 7 segments |
Viral proteins | 10 total | 11 total | 9 total |
Unique viral protein | M2 | NB | HEF |
Antigenic determinants | Hemagglutinin and neuroaminidase | Hemagglutinin and neuroaminidase | Hemagglutinin and neuroaminidase |
Genetic change | Antigenic shift and drift | Antigenic drift | Antigentic drift |
Host range | Avians, humans swine, marine mammals, horses | Humans | Humans and swine |
Human epidemiology | Pandemics and seasonal epidemics | Seasonal epidemics | No seasonality |