. A manual of elementary zoology . Zoology. Fig. 215. — The female of Filaria bancrofti. Fig. 216.—Filaria bancrofti.—From the Transactions of the Society of Tropical Medicine, after Leiper. A, Head ; B, tail of male—showing the arrange- ment of papillae characteristic of the species. (or F. diurna), whose larvae retreat at night. If the patient be made to sleep by day, the larvae reverse their habit. The parasites cannot be destroyed, but may be avoided by measures against mosquitoes. They are widespread in warm countries. 7. Larvm and adult parasitic, without free stage, in hosts of the same
. A manual of elementary zoology . Zoology. Fig. 215. — The female of Filaria bancrofti. Fig. 216.—Filaria bancrofti.—From the Transactions of the Society of Tropical Medicine, after Leiper. A, Head ; B, tail of male—showing the arrange- ment of papillae characteristic of the species. (or F. diurna), whose larvae retreat at night. If the patient be made to sleep by day, the larvae reverse their habit. The parasites cannot be destroyed, but may be avoided by measures against mosquitoes. They are widespread in warm countries. 7. Larvm and adult parasitic, without free stage, in hosts of the same or related species.—The cause of trichinosis, Trichinella spiralis, lives, when it is adult, in the small intestine of rat, pig, or man, and there pairs (male I mm. long, female 3—4 mm.). The larvae migrate through the gut-wall to blood vessels, and are carried to muscles, where they encyst. The tissues of the host enclose the cyst in a capsule, and the larvae remain till the host be eaten by another individual of the same or another species, when they become adult in the intestine and young are produced viviparously, the mother lying in the intestinal wall. The symptoms produced in the host are intestinal catarrh during the piercing of the gut-wall, rheumatic pains and fever during migration, and general cachexia during encystment. The disease may or may not prove fatal. It can be avoided by meat inspection and thorough cook- ing. It is found in all parts of the world. 8. No larval stage. Adult parasitic in the gut of a vertebrate : eggs pass out in faces and are swallowed by another individual of the same. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
