. Parasites and parasitosis of the domestic animals : the zoo?logy and control of the animal parasites and the pathogenesis and treatment of parasitic diseases . Domestic animals. 198 PARASITES OF THE DOMESTIC ANIMALS. Fig. 107.—Diagram Cystioercus. 7 by mm* (9/32 by 3/16 of an inch), while those of the bladder were 6 by 4 mm. (1/4 by 3/16 of an inch). Degeneration.—After a period of time, depending somewhat upon their location, the cysticerci undergo caseous degeneration followed by calcareous infiltration. That these changes may set in early has been shown in the experiments of Hertwig,
. Parasites and parasitosis of the domestic animals : the zoo?logy and control of the animal parasites and the pathogenesis and treatment of parasitic diseases . Domestic animals. 198 PARASITES OF THE DOMESTIC ANIMALS. Fig. 107.—Diagram Cystioercus. 7 by mm* (9/32 by 3/16 of an inch), while those of the bladder were 6 by 4 mm. (1/4 by 3/16 of an inch). Degeneration.—After a period of time, depending somewhat upon their location, the cysticerci undergo caseous degeneration followed by calcareous infiltration. That these changes may set in early has been shown in the experiments of Hertwig, who found them four weeks after infestation. Commonly the degenerative changes do not occur until full development is reached or for some time after. The cysticerci most likely to undergo early degeneration are those located in the heart, while those of the muscles of mastication probably survive the longest. If they are found degenerated in the latter muscles, therefore, it is not hkely that cysticerci in other parts of the body will be living unless they are from a later infection. The degenerated cysts may be recognized by their yellowish, or some- times greenish color. They may be semisohd or quite gritty; pus may be present as a result of pyogenic or- g-anisms gathered by the embryos in their migrations. The caseation, how- ever, may not always involve the para- site. In such cases the scolex is likely to be found just under the cyst wall with its usual characteristics retained, though the caudal bladder is apparently absent. As cysts when dissected away and ex- posed to the air tend to shrink by evapo- ration, their structure is more easily made out if they are kept, moistened with a drop or two of water during the examination. Vitality.—The cysts of beef measles naturally disintegrate at about three weeks after the death of the host, there- fore meat kept in cold storage for this period will not be likely to contain livirig larvse. In fresh beef all will be killed
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdomesti, bookyear1920
