[Listeria infection of a twin pregnancy (author's transl)].

A Listeria infection of a twin pregnancy had induced a partus immaturus at 23 weeks. One foetus died in utero of a widespread foeto-placental granulomatosis, while the other one, dying sub-partu, showed only retroplacental abcesses. The unequal extent of the infection in the two placentas -- of diamniotic, dichorionic type -- is interpreted as different stages of the same disease; it could be due to a different resistance to the germ between the two dizygotic foetuses.