[Developmental bilharziasis caused by Schistosoma mansoni discovered 37 years after infestation]

The authors report a case of Mansoni Schistosomiasis whose course in always running thirty-seven years after the first and alone infestation in a fifty-six old man who come back from Madagascar in February 1948 and lives in France since this period eggs of schistosomiasis were living in a biopsy of rectal and sigmoid mucosea. Problem of adult worms longevity and clinical importance of such prolonged inapparent schistosomiasis are discussed.