. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . the muscular fibers. The cyst is transparent, mm.( inch) long, and mm. ( inch) wide. After from five toeight months calcification may even involve the inclosed trichina the other hand, the capsule may undergo fatty degeneration and calci-fications, a pathological change which takes place at times early, at othersonly after the lapse of years. The encapsulated trichina remains livingand, capable of development for a long time—according to Dam
. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . the muscular fibers. The cyst is transparent, mm.( inch) long, and mm. ( inch) wide. After from five toeight months calcification may even involve the inclosed trichina the other hand, the capsule may undergo fatty degeneration and calci-fications, a pathological change which takes place at times early, at othersonly after the lapse of years. The encapsulated trichina remains livingand, capable of development for a long time—according to Damman,in hogs eleven years, while in man they have remained living 25, 27,30, and 40 years after infection. It has been shown by Zenker that theencysting is not a necessary condition to the mature development of youngtrichinae. Human infection having been conclusively shown to be due to the eatingof raw pork infested with trichinae, it is not at once evident how swine be-come infected. It is well known that the rats which infest slaughter housesare infected in large nimibers, but it is plain also that they may acquire. Fig. 65.—Section of humanmuscle containing encysted Iriclii-nclla spiralis; parasite and its cystcut in section, and but a part ofthe larval worm shown; aboutupper pole a local fat deposit. TRICIIINIASIS 225 trichinae by eating pork. The two probably contribute mutually to theperpetuation of the disease. As to the distribution of the trichiniasis: most epidemics have beenin Germany. Even in America, where there have been two or threeepidemics, it has been in German immigrant communities. Apparentlyit is rather the imperfect cooking of the pork which is responsible, for al-though a larger percentage of American pork appears to be infected thanGerman, yet, as already stated, the disease is much more infrequent inAmerica than in Germany. It is to be remembered that while thoroughcooking effectually destroys the parasites, the requisite heat may failto reach the in
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