Crossword Genius

Seasonal illness (3)

Ross

I believe the answer is:

flu

'seasonal illness' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for flu that I've seen before include "Highly contagious viral disease" , "Mild infection" , "Influenza, in short" , "In brief, winter illness" , "Viral infection (abbr)" .)

I've seen this clue in the Universal and the USA Today.
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