Psittacosis

"Parrot Disease"

     C. S. Lewis, The pilgrim's regress:  an allegorical apology for Christianity, reason, and romanticism III.8-IV.1 ((Grand Rapids, MI:  Wm. B. Eerdmans Publishing Company, 1974/1958 [1943/1933]), 61-66).  Cf. the more accurate clinical definition in the OED.