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Answer: Influenza is a virus that's spread from person to person. It originates, actually, among birds and other animals such as pigs, and new viral strains of influenza come to this country and to Europe from Southeast Asia. That's the global pattern. But close to home, influenza is a virus that we have in our throats and we transmit to each other when we're in close contact and also when we get the virus on our hands and touch each other and touch our noses and our mouths and that way we can transmit the virus from one person to another.
Influenza A viruses are found in many different animals, including ducks, chickens, pigs, whales, horses and seals. Influenza B viruses circulate widely only among humans. Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: the hemagglutinin (H) and the neuraminidase (N).ll 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.