[A remarkable case of symbiotic psychosis]

The symbiontic psychosis of an elderly married couple is described, which was based on delusions of jealousy held by the inducing, tardive schizophrenic wife. Acceptance of the delusion by the egoweak, psycho-organically impaired husband had far-reaching consequences (surgical castration, treatment with anti-androgens). Special attention is paid to psychopathology as well as to psychodynamic and semiotic aspects of the delusional illness.