Crossword Genius

Invulnerable to an infection (6)

Ross

I believe the answer is:

immune

(Other definitions for immune that I've seen before include "Not susceptible to, say after inoculation" , "Secure against, infection say" , "Exempt or protected" , "Protected - unaffected" , "Exempt, secured against" .)

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