Crossword Genius

Source of infection (5)

Ross

I believe the answer is:

virus

(Other definitions for virus that I've seen before include "Cause of computer failure?" , "Microscopic infectant" , "Corrupting influence" , "Microscopic entity capable of reproducing within cells" , "Hidden destructive code in a computer program, or cause of illness" .)

I've seen this clue in the Sydney Morning Herald.
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