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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.
Type A influenza virus is the most virulent form of influenza and the one that causes the most severe illness. This virus often originates in populations of wild birds, poultry, or swine (including pigs and hogs), so different strains are sometimes referred to as avian (bird) or swine flu.ype B influenza is not divided into subtypes, but the virus does mutate into different strains. Unlike Type A, Type B influenza is active throughout the year. Nevertheless, it generally causes a much milder form of the flu than Type A viruses.