comes about the same time each and every year. "The name influenza derived from an observation made more than 200 years ago that epidemics of cough and fever occurred more frequently at certain times of the year. At the time, the conclusion was drawn that such epidemics occurred under the influence of particular constellations of planets"(Schullman 1). This information is clearly a misconception of medieval time's notion and beliefs. The flu is derived of three strains, A, B, and C, which each contain many different strains. Though a pandemic is scheduled every thirty to forty years, the latest and largest encounter of the flu was in 1918.
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