Crossword Genius

Widely shared, say (5)

Ross

I believe the answer is:

viral

(Other definitions for viral that I've seen before include "Pertaining to an ultramicroscopic infection" , "Like pathological agents" , "Caused by pathogenic agent" , "Rapidly becoming popular online" , "Relating to a pathogenic agent of disease" .)

I've seen this clue in The New York Times.
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