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ORDER V

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Originally appearing in Volume V26, Page 413 of the 1911 Encyclopedia Britannica.
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ORDER V  .—Tetracotylea (Taeniidae) . Scolex with four suckers, rarely hooked, and with a rostellum . Mostly parasitic in homoiothermic (warm-blooded) vertebrates . Selected forms: See also:Taenia solium, See also:intestine of See also:man (fig . 3, C) . T. saginata (fig . 3) without hooklets on the rostellum; intestine of man . T. murina, in the See also:rat and See also:mouse, the adult in the lumen of the intestine, the larvae in the villi . ,This See also:species therefore undergoes no See also:change of See also:host . Cystotaenia coenurus, intestine of See also:dog and See also:wolf, larva (a coenurus, fig. i i) in the See also:brain of See also:sheep; allied forms occur mature in the dog and larval in the See also:rabbit . Echinococcifer echinococcus, a See also:minute See also:form with only three to five proglottides, in dog, wolf, See also:jackal . Larval See also:stage a multilocular See also:sac (fig .

II B) with many scolices; found in man, ungulates, carnivores, rodents and monkeys . Table of Cestodes found in Man Dibothriocephalus latus (L.) Plerocercoid See also:

Pike, See also:perch, See also:trout, &c . Dibothriocephalus cordalus Unknown (Leuck.) Diplogonoporus grandis (Blanch.) Dipylidium caninum (L.) . Cysticercoid Trichodectes canis; Pulex serraticeps; P. irritans Ilymenolepis dirninnata Cysticercus Asopia far- (Rud.) inalis Anisolabis annulipes Insecta Acisspinosa Seaurus striatus H. nana (v . Sieb.) . Cysticercus See also:Insects and myria- pods Drepanidotaenia lanceolata Cysticercoid Cyclops, Diaplomus (See also:Bloch) Davainea nzadagascarensis Unknown (See also:Day.) Davainea (?) asiatica Taenia solium (L.) . 7'. saginata (Gotze) T. africana (v . Linst.) . T. confusa (See also:Ward) . T. echinococcus (v . Sieb.) . and J .

See also:

Hornell, See also:Ceylon See also:Pearl See also:Oyster See also:Report, See also:London, The Royal Society, See also:part ii. p . 77, part iii. p . 449, part v. p . 43, 1903—7; (7) W . B . See also:Spencer " Gyrocotyle=Amphiptyches," Trans . See also:Roy . See also:Soc., See also:Victoria, vol. i . (1889); (8) S . Goto, " Homology of Genital Ducts," Centralbl. f . Bact. u . Parasilenkunde, vol .

Phoenix-squares

14 (1893), p . 797; (9) Mrazek, Archigetes," Verhandl. d. bohm . Akad . Sci . (See also:

Prague, 1897) . Full references to further literature will be found in Braun's See also:works . (F . W . GA.) See also:Medicine.—For See also:practical purposes we have only three varieties of See also:tapeworms to See also:deal with as inhabitants of the human alimentary See also:canal: Taenia saginata, the See also:beef tapeworm; Taenia solium, the pork tapeworm; and Dibothriocephalus latus, the See also:fish tapeworm . The first of these is prevalent in countries where much and imperfectly cooked beef is eaten, and where See also:cattle in their turn are exposed to the infection of the tapeworm ova . Comparatively uncommon in Western See also:Europe, the Taenia saginata is See also:common in Eastern Europe, See also:Asia and See also:South See also:America . It is calculated that in the See also:North-See also:West Provinces of See also:India 5 per cent. of the cattle are affected with cysticerci owing to the filthy habits of the See also:people .

Measly beef (that infected with the Cysticercus bovis) is easily recognized . In See also:

Berlin the proportion of cattle said to be found infected on inspection in 1893 was 1 in 672 . See also:Cold storage for a See also:period of over three See also:weeks is said to kill the cysticercus . The tapeworm most frequently found in man in Western Europe is the Taenia solium, which is See also:constant wherever pork is consumed, and is more common in parts where raw or imperfectly cooked pork is eaten . In North See also:Germany the mature tapeworm was found on See also:post-mortem examination once in every 200 bodies examined, while its embryo, the Cysticercus cellulosae, was found in I in every 76 bodies . In See also:France, See also:Great See also:Britain and the See also:United States the prevalence is not so great . The Dibothriocephalus latus is not generally found except in districts bordering the Baltic See also:Sea, the districts See also:round the Franco-Swiss lakes and See also:Japan . In St See also:Petersburg 15 per cent. of the in-habitants are said to be affected . The eggs are See also:free in fresh-See also:water lakes and See also:rivers, where they enter the bodies of pike, turbot and other fishes, and are thus eaten by man . In many instances the existence of a tapeworm may not cause any inconvenience to its host, and its presence may be only made known by the presence of the proglottides or mature segments in the stools . In the Taenia solium it takes 3 to 32 months from the See also:time of ingestion of the embryo to the passage of the matured segments, but in the Taenia saginata the time is only about 6o days . The segments of the Taenia solium are usually given off in chains, those of the Taenia saginata singly .

In a number of cases there are colicky pains in the See also:

abdomen, with See also:diarrhoea or See also:constipation and more or less See also:anaemia, while the Dibothriocephalus latus is capable of producing a profound and severe anaemia closely resembling pernicious anaemia . The knowledge of the presence of the See also:parasite adversely affects See also:nervous people and may See also:lead to See also:mental depression and hypochondria . Nervous phenomena, such as chorea and epileptic seizures, have been attributed to the presence of the tapeworm . The prophylaxis is important in See also:order to limit the spread of the parasites . All segments passed should be burnt, and they should never be thrown where the embryos may become scattered . See also:Attention should be paid to the careful cooking of See also:meat, so that any parasite See also:present should be killed . Efficient inspection of meat in the abattoirs should eliminate a large proportion of the diseased animals . In the treatment of a See also:case where the parasite is already present, for two days previous to the employment of a vermifuge a See also:light See also:diet should be given and the bowels moved by a purgative . For twelve See also:hours previously to its See also:administration no See also:food should be given, in order that the intestinal See also:tract should be empty so as to expose the tapeworm to the full See also:action of the See also:drug . The vermifuge is given in the See also:early See also:morning, and should consist of the liquid See also:extract of See also:felix mas, male See also:fern, one drachm in emulsion or in capsules to be followed in See also:half an See also:hour by a See also:calomel purgative . See also:Castor-oil should not he used as a purgative . See also:Pomegranate See also:root, or, better, the sulphate of pelletierine in dose of 5 grains with an equal quantity of tannic See also:acid, may be used to replace the male fern .

In from 5o to 8o per cent. of cases the entire tapeworm is expelled . The See also:

head must be carefully searched for by the physician, as should it fail to be brought-away the parasite continues to grow, and within a few months the segments again begin to appear .

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