Report of an imported case of Dipetalonema perstans in Japan.

A case of Dipetalonema perstans infection in a 34-year-old Japanese male is presented and from his past history there is no doubt that he obtained the infection in Zaire, Africa. The morphology and periodicity of the microfilaria were studied in detail and the clinical manifestations of the infection documented. This is the first report of imported D. perstans infection in Japan.