Influenza ("the flu") is a class of viruses that seasonally infect people and animals in many different forms. Influenza is generally only life threatening in elderly, very young, or in people with compromised immune systems.
1918 Pandemic
The "Spanish Flu" pandemic of 1918-1919 was the most deadly outbreak of influenza to occur in recent history.
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Avian
This category is for sites about avian or bird flu, a viral disease of birds.
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