Crossword Genius

Rapidly spreading online (5)

Ross

I believe the answer is:

viral

(Other definitions for viral that I've seen before include "Pertaining to an ultramicroscopic infection" , "Like the common cold" , "Go ___ (take off via the internet)" , "Caused by pathogenic agent" , "Like pathological agents" .)

I've seen this clue in the USA Today.
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