. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 250 THE TAPEWORMS. "I, Fig. 97. Echinccoccus in liver of man from Stiles.) cyst The great size to which hj^datids may grow makes them dangerous on account of the mere mechanical damage they may do, especially if they occur in such organs as the heart, brain, kidneys or liver. The liver of an ox containing hydatids has been known to reach ten times its nor- mal weight, and to be of such large size as to cause much mechanical in- jur}' to neighboring organs. But more dangerous than the mechanical inj
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 250 THE TAPEWORMS. "I, Fig. 97. Echinccoccus in liver of man from Stiles.) cyst The great size to which hj^datids may grow makes them dangerous on account of the mere mechanical damage they may do, especially if they occur in such organs as the heart, brain, kidneys or liver. The liver of an ox containing hydatids has been known to reach ten times its nor- mal weight, and to be of such large size as to cause much mechanical in- jur}' to neighboring organs. But more dangerous than the mechanical injury is the possibility that the vesicles, hemmed in by restraining tissues, may burst and liberate into the tissues the poison-bearing liquid which fills them. Hydatids may grow persistently for many years. There is one case on record where a swelling had gradually developed during 43 years over a large portion of the face of a woman, and (After Huher was as large as a child's head. When removed by an operation, this was found to be a hydatid. Ordinarily growth does not increase Ijej'ond the size of a baseball. The only treatment is a surgical operation. The conditions which exist in places where hydatid disease in man is common gives us an idea of what to avoid in order to pre- vent infection. In Iceland from 30 to 100 per cent of the dogs in different regions are said to be parasitized by Echinococcus. A large proportion of the sheep and many cattle are infested with the hydatids. The dogs are fed on the uncooked entrails and waste meat of slaughtered animals, and the dogs in turn are allowed to run at will over the pastures, dropping the egg-laden proglottids with the faeces in places where the water or food of the stock may be infected. Dogs are allowed the free run of the houses, are given unbounded liberty in playing with children, and not infrequently eat from the same dish as their human companions. The resulting prevalence of Echinococcus in both dogs, stock and man is
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
