Crossword Genius

Disease-causing organism (5)

Ross

I believe the answer is:

virus

(Other definitions for virus that I've seen before include "Microscopic infectious agent" , "Microscopic infectant" , "Illegal program introduced maliciously into computers to disrupt them" , "Submicroscopic organism, cause of disease" , "Harmful agent to animals and computers" .)

I've seen this clue in the Evening Standard.
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