. Des parasites animaux et la maladie humaine. Parasitologie médicale ; insectes en tant que porteurs de la maladie. 17350). RHINOSPORIDIUM Peu est connu de la symptômes produits par ces para- sites, mais puisqu'ils Uve à l'intérieur de cellules épithéliales de l'intestin ou le foie, ils doivent être préjudiciable. Wenyon a récemment fait état de symptômes dysentériques dans un cas où aucun parasites intestinaux sauf Isospora étaient présents. Coccidies sont un-^ doubtedly oocy mmW /par l'ingestion de l'eau ou d'aliments pollués par de la boue et la saleté, par de mauvaises habitudes alimentaires, et par les mouches. Rhinosporidium, un parasite de la nez. Dans Sporozolte sporocyste nativ

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. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. RHINOSPORIDIUM 173 50). Little is known of the symptoms produced by these para- sites, but since they Uve inside epithelial cells of the intestine or liver they must be injurious. Wenyon has recently reported dysenteric symptoms in a case in which no intestinal parasites except Isospora were present. Coccidians are un- /mmW oocy^ doubtedly spread by means of water or food polluted by mud and dirt, by unsanitary habits, and by flies. Rhinosporidium, a Parasite of the Nose. Sporocyst Sporozolte In natives of India there is occasion- FiG. 50. Oocyst of Eimena ally observed a peculiar infection of the containing four sporocysts, each nose in which a red tumor, flecked with ^"^ *^° sporozoites. whitish spots, and hkened by some authors to a raspberry, grows out from the partition or septum of the nose, remaining attached by a narrow stalk. The tumors are not very painful, but they tend to block the nasal passages. It has been suggested that this disease, known as nasal polypus, may have the same in- fluence on the intellect of children that other impediments of the nose and throat are known to have. When the tumor is cut the white spots visible on the surface are seen to be scattered throughout the tissue and to be of very variable size. Microscopic examination shows them to be the cysts of a protozoan parasite in various stages of development. The parasite has been named Rhinosporidium kinealyi, and is classified as a member of the group of Sporozoa known as Hap- losporidia. The cysts in the tumor are filled with great numbers of spherical or oval bodies, the pansporoblasts, each of these in turn contain- ing from one to a dozen closely-packed spores (see small portion of a cyst in Fig. 51). The manner of development of the cysts and of the tumor can readily be discovered from the various stages of development of different cysts and parts of cysts which can be observed in

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