I present for your consideration a somewhat brief and imperfect account of one of the rarer nematodes; rare, at least in this climate and latitude, though occurring with considerable frequency in tropical and sub-tropical countries. I refer to the Strongyloides intestinalis. The parasite is endemic in Cochin China, where it occurs in association with the diarrhea peculiar to the country—hence the name bestowed on it by European physicians, "Cochin China diarrhea."
This animal forms one of the class of parasites whose pathologic action is limited to the intestinal canal, and does not extend, as does that of the Amœba coli, to the liver and other organs. Teissier has claimed to have observed rhabditiform embryos circulating in the blood, and to have produced metastatic foci in the lungs of infected frogs. These observations, however, have not been confirmed by any other observer, and, for the present, we must conclude that the parasite's pathologic influence is lmited