. Animal biology. Zoology; Biology. 182 METAZOAN PHYLA Mou-fh Esophagus- Nerve This journey through the body is injurious to the young pig, retarding its growth. The passage of the worm through the kings causes serious pulmonary disturbances, and young pigs harboring many parasites remain poorly nourished, weak, and unprofitable to the grower. Infection is avoided by carefully cleaning the body of the mother before the time for farrowing, by placing her at this time in a perfectly clean pen with clean straw, and by removing both her and the young pigs to clean pasture just as soon as they can
. Animal biology. Zoology; Biology. 182 METAZOAN PHYLA Mou-fh Esophagus- Nerve This journey through the body is injurious to the young pig, retarding its growth. The passage of the worm through the kings causes serious pulmonary disturbances, and young pigs harboring many parasites remain poorly nourished, weak, and unprofitable to the grower. Infection is avoided by carefully cleaning the body of the mother before the time for farrowing, by placing her at this time in a perfectly clean pen with clean straw, and by removing both her and the young pigs to clean pasture just as soon as they can be taken out of the farrowing pen. It is also not advisable to use the same hog lot year after year. As already noted, the ascaris occur- ring in the intestine of man is morpho- logically identical with the pig ascaris. Some physiological difference exists, however, in that eggs from the human ascaris will not complete their develop- ment in pigs and eggs from the pig ascaris will not reach maturity in man. The larval migration, however, occurs in cross infections. 213. American Hookworm.— Another nematode that makes an interesting journey through the body of the host, which is man, is the hook- worm, Necator americanus (Stiles). In our southern states this worm (Fig. 92) formerly affected a large population, estimated to number two milhons, known as "poor whites," who were noteworthy for their shiftlessness, "Tropical Diseases," after Paclencia, by although they were the descendants of the courtesy of Cassell & Comimny.) , . , , i rm very good immigrant stock. These people lived in cabins, frequently with no other floor than the bare earth, were in the habit of going barefooted, and were unsanitary in the disposal of fecal waste. The eggs of the hookworm produced in the bodies of the persons afflicted with this parasite are passed out with the feces and deposited on moist earth. The larvae which hatch from these eggs moult twice before they become inf
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