. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 238 THE TAPEWORMS in an experiment to test the penetration of heat, a ham cooked by boiUng for two hours had reached a temperature of only- US" in the center. When roasted, pork should always be cut into pieces weighing no more than three or four pounds to insure thorough penetration of heat. Beef which has lost its red or " rare " color is quite safe. Since bladderworms are unable to survive the death of their host for more than a limited time, they are eventually destroyed by ordinary c
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 238 THE TAPEWORMS in an experiment to test the penetration of heat, a ham cooked by boiUng for two hours had reached a temperature of only- US" in the center. When roasted, pork should always be cut into pieces weighing no more than three or four pounds to insure thorough penetration of heat. Beef which has lost its red or " rare " color is quite safe. Since bladderworms are unable to survive the death of their host for more than a limited time, they are eventually destroyed by ordinary cold storage — within three weeks in the case of the beef bladderworm, Cysticercus bovis, but not always so soon in the case of the pork bladderworm, C. cellulosce. According to Dr. Ransom temperatures of about 15° F. kill beef bladder- worms within five days. Thorough curing or salting of meat is also destructive to the parasites. Infected persons should be careful not to contaminate the food or water of domestic animals with their fseces, bearing in. Fig. 87. Heads of some adult tapeworms found in man, drawn to scale; A, beef tapeworm, Tceniu saginata; B, pork tapeworm, T. solium; C, fish tapeworm, Dibothriocephalus latus; D, heart-headed tapeworm, Dibothriocephalus cordatus; E, African tapeworm, T. africana; F, double-pored dog tapeworm, Dipylidium caninum; G, dwarf tapeworm, Hymenolepis nana; H, rat tapeworm, Hymenolepis diminuta. X 10. mind the various ways in which the eggs may be disseminated — by streams, rain, flies, etc. The eggs of the dwarf tapeworm, Hymenolepis nana, are thought to be able to develop through the bladderworm stage to the adult in a single host, and should therefore be guarded against by different measures (see p. 243). The larvae of other species of Hymenolepis develop in insect larvse such as mealworms, and are therefore subject to still different means of prevention. The tapeworms of man belong to two quite distinct families, the Taeniidse, in
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