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This discussion on the mental complications and sequelae of influenza is based on sixty cases observed at hospitals for the insane in the vicinity of Bern, Switzerland. As regards time relationship to influenza, the psychoses are divided into those occurring during (1) the prodromal period, (2) the febrile period, (3) defervescence and (4) convalescence. A distinction is made between pure grip psychoses, of which there were forty-five cases in the series, and the cases in which the grip was only one factor. The pure grip psychoses are divided into (1) states with chiefly disorders of consciousness: deliriums, twilight states and amentia; and (2) states with chiefly affective disorders: depressive, manic and hysteriform.
Ueber Grippepsychosen.. JAMA. 1923;81(12):1044. doi:10.1001/jama.1923.02650120076037