Mortality of complex aetiology in a Psittacidae population: epidemiology, clinical features and aetiological study.
During 10 weeks the whole of a collection of about 100 Psittacidae of different species, kept in a Paris flat, died. There was no definite clinical picture, though coryza and emaciation were reported in about half the birds. Four months previously certain rare exotic species had been added to the collection. Examination of eight birds revealed splenomegaly and severe degeneration of the liver which contained, ultrastructurally, herpesvirus particles. A series of blind passages in embryonated eggs produced no embryonic mortality. Chlamydia psittaci was isolated from the pooled organs of three birds.