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For most forms of Influenza with no pre-existing health problems, the mortality rate is less than a quarter of a percent, or about 1 in 400. Cause of death is mostly due to respiratory failure, usually associated with secondary infections. (pneumonia etc..)

Patients with compromised immune systems, the very young and very old, are much more susceptible.

Some (rare) forms of influenza have much elevated mortality rates. Asian bird flu (H5N1) may have a mortality as high as 70%.

The 2009 influenza A (H1N1) outbreak is of normal virulence at present, but its similarity in structure and origin to the 1918 pandemic flu has raised worldwide concern.

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16y ago

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