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Viral infection (3)

Ross

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3

9

influenza

'viral infection' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for influenza that I've seen before include "Common infection" , "Viral infection" , "Viral complaint" , "Respiratory complaint" , "Nasty viral disease, usually of winter" .)

I've seen this clue in The Guardian and The Sunday Times.
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