Skip to main content

Table 1 Characteristics of influenza viruses

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