Viral infection (3)
'viral infection' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for flu that I've seen before include "A bad winter bug" , "Minor ailment" , "Winter ailment" , "Infection reduced" , "Viral illness" .)
'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" .)