The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . UnknownHost(Plerocercus) Fig. 37.—Life cycle and intermediate hosts of bothriocephalus latus (afterBollinger). larvse of this parasite have resulted in the appearance of theadult worm in the intestine (Fig. 37). Taenia Echinococcus {Echinococcus Honiinis).—Occasion- 240 HYGIENE OF TRANSMISSIBLE DISEASES. ally man serves as the intermediate host in the life cycle ofthis organism. The mature worm infests the dog, wolf, andjackal. It is very small, measuring but about 5 mm. () in len
The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . UnknownHost(Plerocercus) Fig. 37.—Life cycle and intermediate hosts of bothriocephalus latus (afterBollinger). larvse of this parasite have resulted in the appearance of theadult worm in the intestine (Fig. 37). Taenia Echinococcus {Echinococcus Honiinis).—Occasion- 240 HYGIENE OF TRANSMISSIBLE DISEASES. ally man serves as the intermediate host in the life cycle ofthis organism. The mature worm infests the dog, wolf, andjackal. It is very small, measuring but about 5 mm. () in length, and is composed of only 3 or 4 segments, thelast and largest of which alone exhibits all the characteristicsof sexual maturity. Its head is very small, is armed with adouble-row of from 30 to 50 heavy hooklets, and is providedwith four suckers (Fig. 36, A). The narrow neck merges into the first, imperfectly devel-oped, segment. The second segment is more markedlydifferentiated, while the third, mature, segment is seen tocontain numerous eggs in which may be detected the six- (Tan. Sol.). Fig. 38.—Life cycle and intermediate hosts of taenia echinococcus (after Bollinger). hooked embryos. For the further development of theembryos after the escape of the eggs from the body it isnecessary that they enter the body of some other animal—•the hog, the ox, or man. Here it penetrates to the viscera,commonly the liver, and enters the larval or cysticercusstage commonly known as hydatid or echinococcus the other cysticerci mentioned, these have the powerwhile in this larval stage of increasing both in size and num-ber. The scolices seen within the cysts, and they are oftennumerous, are each the germ from which a mature wormcan develop when favorable circumstances present—i. c\,when they gain access to the stomach of the dog (Fig. 38).The commonest and practically the only source from whichechinococcus cysts are contracted in man is the dog. SECTION III. PROPHY
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Keywords: ., bookcentury1800, bookdecade1890, booksubject, booksubjectdiseases
