. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. SAECOSPORIDIA 175 several inches in length. Microscopic examination shows that these patches are cysts containing thousands of tiny spores, segregated into chambers (Fig. 52A) which correspond to the pansporoblasts of Rhinosporidium. The spores (Fig. 52C), es- caping from the cyst, ultimately develop into new cysts in much. D Fig. 52. Sarcosporidia. A, Sarcocyslis hlanchardi of ox, longitudinal section of infected muscle fiber (m. f.) showing spores (sp.) in chambers of compartments (comp.); 11., nucleu
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. SAECOSPORIDIA 175 several inches in length. Microscopic examination shows that these patches are cysts containing thousands of tiny spores, segregated into chambers (Fig. 52A) which correspond to the pansporoblasts of Rhinosporidium. The spores (Fig. 52C), es- caping from the cyst, ultimately develop into new cysts in much. D Fig. 52. Sarcosporidia. A, Sarcocyslis hlanchardi of ox, longitudinal section of infected muscle fiber (m. f.) showing spores (sp.) in chambers of compartments (comp.); 11., nucleus of muscle fiber, x 265. (After von Eecke from Wasilewsky.) B, cross section of sarcocyst from human larynx, probably <S, ienella, X 200. Z), same, longitudinal section. (After Baraban and St. Remy.) C, spore of S. tenella of sheep. (After Laveran and Mesnil.) the same way as is the case with the nose parasite. Although the muscle parasites have been known to parasitologists for many years there are portions of the life history which are not yet known. Darling and others have suggested that these pe- culiar protozoans may be " side-tracked varieties of parasites of invertebrate ; We have no definite knowledge of the normal means of transmission although a number of possible methods are known. It has been found that infections can be spread by cannibalism, and that the faeces of infected mice can infect other mice; it has also been stated that spores occur in the circulating blood, which would mean that blood-sucking ar- thropods may be instrumental in the transfer. Fleshflies may also play a part in dispersing the spores. Erdmann has shown that when spores of Sarcosporidia de- velop in the intestine a very powerful toxin, cahed sarcocystin, is discharged and destroys the neighboring epithelial cells of the intestine and thus breaks a way for the young parasite into the. Please note that these images are extracted from scanned page images that may have been
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