File:Public health and preventive medicine (1902) (14597423890).jpg

Identifier: publichealthprev00lewi (find matches)
Title: Public health and preventive medicine
Year: 1902 (1900s)
Authors: Lewis, Charles James, 1875-1937 Balfour, Andrew, Sir, 1873-1931
Subjects: Preventive Medicine Public Health
Publisher: Edinburgh : Green
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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sages them-selves, as the cysts are not confinedto the muscle, but occur in the pan-niculus adiposus, the coats of theintestine, and the scraps so frequentlyused in pork factories for the manu-facture of sausages. Attention must therefore bedirected to these sources of infection. Rhabdonema intestinale.— This worm infests the duodenum andjejunum of man, but is harmless.In the parasitic form the adult femalealone is known. The worm has alsobeen demonstrated in fowls. It is a thin parasite, TV to -Jg-in. in length, and may be recognisedby the accumulation of five or sixeggs about the centre of its body(Fig. 32, b). The ova pass into theintestinal contents, and the contained embryos rapidly develop, the shellsare ruptured, and the young parasites dart hither and thither amongstthe faeces (Fig. 32, a). The ova themselves are thus rarely found inthe faeces, but when present occur in short strings (Fig. 32, c). Theembryos are voided with the faeces, and if they are to live the faeces must
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Fig. 32, -Rhabdonema intestinale. a, Male. h, Female, c, Ova. HEMOPOIETIC SYSTEM 9i peach water. For the development of sexual forms with the sexes distinct,a high temperature is necessary. Thus the free adult forms are produced,which form embryos, and these embryos being transferred to man become theadult parasitic forms. At a low temperature the original embryo developsinto a filariform larva, which likewise becomes parasitic if it gains access to man. Geographical Distribution.—Cochin-China, Egypt, Brazil, etc. Method of Transmission.—Alimented.—Water is the chief vehicle. Possibly aerial, in wind-borne dust. Prevention of Origin and Spread.—Pure water supply. Propercooking of vegetables. The use of anthelmintics. Strongylus subtilis.— Geographica l Distribution.—Egypt. It is found in the small intestine, and produces no symptoms. The following Trematodes are found in the human intestine:— Name. Definitive Host. DistoMn heterqphyes .Amphistomum Tiominis Man.—It lias

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