. Des parasites animaux et la maladie humaine. Comme les insectes porteurs de la maladie ; parasitologie médicale. 288 la trichine vers de petites parties d'un grand nombre de porcs, et l'infection, le cas échéant être présent parmi les porcs concernés, est nécessairement très dilué, de sorte qu'aucun individu qui a consommé la saucisse est du tout susceptibles d'ingérer un nombre suffisant d'trichinse pour produire un effet appréciable, même si les parasites devrait arriver à survivre à la guérison des processus pour lesquels la saucisse commercialement préparé est généralement soumis." L'histoire de la vie. - Thejrichina ver, Trichinella spiralis,

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. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 288 TRICHINA WORMS small portions from a large number of hogs, and the infection, if any be present among the hogs involved, is necessarily greatly diluted, with the result that no individual consuming the sausage is at all likely to ingest a sufficient number of trichinse to produce an appreciable effect, even though the parasites should happen to survive the curing processes to which the commercially pre- pared sausage is usually subjected." Life History. — Thejrichina worm, Trichinella spiralis, occurs in quite a large number of animals, but the readiness with which' infection occurs in dif- ferent species of ani- mals varies greatly. In America hogs are most commonly in- fected, and infection is common in rats which have access to waste pork; in Europe dogs and cats commonly show a higher percent- age of infection than hogs in a given local- ity. Man is highly susceptible, in fact so susceptible that he cannot be considered a normal host of the parasite. Rats and mice are sometimes thought to be the pri- mary hosts of the worm, but the fact that these rodents succumb easily to infection while the parasites are still in the intestinal stage tends to show that rats are not normal hosts. Rabbits and guinea-pigs are easily infected when fed meat containing the worms, and a number of other mammals can occasionally be infected artificially. The worms gain entrance to the digestive tract as larvae en- cysted m meat (Fig. IISJ. In the intestine of the host they are. Fig. 118. Larv£E of trichina wf)rm.s, Trichinella spiralis, encysted in striped muscle fibers in pork. Camera lucida drawing of cysts in infected sausage. X 75.. 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 work.. Chandler, Asa Crawford, 1891-1

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• bookcentury1900
• bookdecade1910
• booksubjectmedical
• bookyear1918