The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . Fig. 33.—Head of t;enia saginata. A, neck retracted; Ji, neck extended(after Leuckart). and organs, there to cause little or no inconvenience ; or, whenvery numerous, to give to more or less grave symptoms,according to their locality. DISEASES DUE TO ANIMAL PARASITES. 237 Occasionally this accident occurs in persons already sup-porting a mature worm, the segments of which are passedinto the stomach during attacks of vomiting, there to liberateembryos that penetrate into the muscles
The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . Fig. 33.—Head of t;enia saginata. A, neck retracted; Ji, neck extended(after Leuckart). and organs, there to cause little or no inconvenience ; or, whenvery numerous, to give to more or less grave symptoms,according to their locality. DISEASES DUE TO ANIMAL PARASITES. 237 Occasionally this accident occurs in persons already sup-porting a mature worm, the segments of which are passedinto the stomach during attacks of vomiting, there to liberateembryos that penetrate into the muscles and viscera. Taenia Saginata or Mediocanellata {Beef Tape-worm).—This is the largest tape-worm encountered in man, being oftenas much as 20 to 25 feet long and consisting of from 1000 to1500 segments. The mature segments measure from 17 to20 mm. ( inch) in length, and from 5 to 7 mm. ( FlG. 34.—Cysticerci bovis. A, in muscle ; B, developmental form ; headeverted (Leuckart). inch) in breadth. The head is relatively larger thanthat of tcBuia solium; it is provided with four strong,prominent suckers, but has no booklets (Fig. 33). Sexualmaturity begins with about the 600th proglottide. Eachmature segment is sexually complete—/. e., is provided withboth male and female generative organs. Development isso rapid that it is said that as many as 10 fully mature pro-glottides containing ova in large numbers may be ejecteddaily. The ova have not the power of further develop-ment when thrown off from the body, unless they are takeninto the stomach of the ox ; then the embryos pass into the 238 HYGIENE OF TRANSMISSIBLE DISEASES. voluntaiy muscles, to remain as bladder-worms or cysticercibozds (Fig. 34). Beef so infected is referred to as is upon the eating of such uncooked measled beef thatthe larx-ai of tceiiia sagiiiata are introduced into the alimentarytra
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Keywords: ., bookcentury1800, bookdecade1890, booksubject, booksubjectdiseases
