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swine flu vs. flu

swine flu
[swahyn floo] / ˈswaɪn ˈflu /

noun

Pathology.

  1. a form of influenza that afflicts pigs.

  2. a form of influenza that afflicts humans by infection with a virus once thought to be very similar to the influenza virus found in North American pigs.

flu
[floo] / flu /

noun

  1. influenza.

  2. a specific variety of influenza, usually named for its point of dissemination or its animal vector.

    Hong Kong flu; swine flu.