We report on a case of psittacosis which presented first as an atypica
l pneumonia and in the further course as a paranoid syndrome with a co
ncomitant disorder of consciousness. in contrast with reports from the
literature there were no obvious neurologic signs and symptoms which
would have indicated the organic nature of the illness. Therefore, the
correct diagnosis was based on a careful anamnesis, clinical and psyc
hopathological examination and confirmatory results of serological tes
ts.