. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. Fig. 47. Comparison of three species of malaria parasites X 2000 (figures selected largely from Manson). A, A' and A", Plasmodium vivax; B, B' and B", Plasmodium malarias; C, C and C", Plasmodium falciparum. A, B and C, mature parasites in red corpuscles. A', B' and C", segmented parasites ready to leave corpuscles. A", B" and C , mature gametocytes. The quartan parasite more closely resembles the tertian para- site in flexibility of body and form of gametocytes (Fig. 47C&q
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. Fig. 47. Comparison of three species of malaria parasites X 2000 (figures selected largely from Manson). A, A' and A", Plasmodium vivax; B, B' and B", Plasmodium malarias; C, C and C", Plasmodium falciparum. A, B and C, mature parasites in red corpuscles. A', B' and C", segmented parasites ready to leave corpuscles. A", B" and C , mature gametocytes. The quartan parasite more closely resembles the tertian para- site in flexibility of body and form of gametocytes (Fig. 47C"), but it differs in that it does not cause the corpuscle to enlarge (Fig. 47C) and is never active in movements. It produces only from five to ten spores, the nucleus normally undergoing three splits. The spores form a very regular rosette or " daisy-head," ar- ranging themselves petal-like around the dark mass of pigment in the center (Fig. 47C). Unlike either of the other parasites this one causes ague by its sporulation once in 72 hours instead of in 48 hours. A comparison of certain phases of this parasite with the same phases of the others will be found in Fig. 47. Propagation. — As remarked above infection with malaria is now known to take place exclusively through the bites of certain species of mosquitoes, all belonging to the genus Anopheles (in- cluding its subgenera). While over a hundred species of Anoph-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chandler, Asa C. (Asa Crawford), 1891-1958. New York, J. Wiley & sons, inc. ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
