. The care of animals;. Veterinary medicine; Domestic animals. 352 The Care of Animals mot be used for food, nor placed where animals can eat at, unless it has been thoroughly cooked to kill the paitasites. TRICHINA IN MEAT Trichinosis is a disease especially of pigs and man, 'Caused by the invasion of the tissues of the body by a minute round-worm (Trichina spiralis), that bores its way to the different parts of the body, and then be- comes encysted. Fig. 54. Man usually contracts the disease by eating infested pork that has not been thor- oughly cooked. Trichinae in pork are invisible to the
. The care of animals;. Veterinary medicine; Domestic animals. 352 The Care of Animals mot be used for food, nor placed where animals can eat at, unless it has been thoroughly cooked to kill the paitasites. TRICHINA IN MEAT Trichinosis is a disease especially of pigs and man, 'Caused by the invasion of the tissues of the body by a minute round-worm (Trichina spiralis), that bores its way to the different parts of the body, and then be- comes encysted. Fig. 54. Man usually contracts the disease by eating infested pork that has not been thor- oughly cooked. Trichinae in pork are invisible to the naked eye. When taken into the stomach, the encj^sted worm is liberated, develops into an adult, and the females give birth to large numbers (ten to fifteen thousand) of embryo young. These young worms migrate, boring their way, or carried by the blood and lymph, to distant parts of the body, there developing the cyst stage. When these cysts are examined under a micro- scope, each is found to contain the â small, cylindrical embryo worm, in a coiled or spiral position, from which it takes its Latin name. When meat infested with trichinse is eaten, there follows, in the human subject, considerable irritation of the bowels, associated with diarrhea. This occurs in three to ten days after the meat has been eaten. During this period, the worms are multiplying in the dige§tiye tract of the patient. Following this, there i§. Fig. 54. Trichina spiralis -encysted in lean meat. 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 Mayo, Nelson S[later], 1866- [from old catalog]. New York, London, The Macmillan company
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