Table 1 |
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Characteristics of influenza viruses |
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| Influenza A |
Influenza B |
Influenza C |
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| 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 |
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Sandrock and Kelly Critical Care 2007 11:209 doi:10.1186/cc5675 |
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