The word Influenza comes from "influence" and refers to the cause of the disease; Changes in medical thought led to its modification to influenza del freddo, meaning "influence of the cold" Thus "flu" is short for "influenza".
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Influenza is the full form for flu. It is caused my a virus that mutates over the season. It is an severe upper respiratory infection and not at as bad as a cold.
Superfluous has 4 syllables:su-per-flu-ousFour
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Though he had the flu, he opted to go on vacation anyway, and flew off to Hawaii.