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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 virus is the group that most commonly causes illness in humans and is the source of all of the major influenza pandemics in modern history. This type can drift and shift through birds and animals, meaning it emerges with rearranged surface proteins that create different strains of the virus. The surface proteins that combine in different ways to create an assortment of influenza virus type A strains are called hemagglutinin (HA) and neuraminidase (NA).