. Medical diagnosis for the student and practitioner. red cell count. Cell deformity is marked in the severercases, but normoblasts predominate. FILARIASIS.—This extraordinary parasite includesthree chief species. The Filaria bancrofti, also callednocturna, is found in the peripheral blood only at night; or during sleep, whereas the Filaria loa, or diurna, isfound only during the waking hours or in daylight. Thepeculiar habits Filaria perstans is present day and night and is said tobe present in from 50 to 90 per cent, of West Africannegroes, being apparently non-pathogenic. The Filariademarqu
. Medical diagnosis for the student and practitioner. red cell count. Cell deformity is marked in the severercases, but normoblasts predominate. FILARIASIS.—This extraordinary parasite includesthree chief species. The Filaria bancrofti, also callednocturna, is found in the peripheral blood only at night; or during sleep, whereas the Filaria loa, or diurna, isfound only during the waking hours or in daylight. Thepeculiar habits Filaria perstans is present day and night and is said tobe present in from 50 to 90 per cent, of West Africannegroes, being apparently non-pathogenic. The Filariademarquayi is found in the West Indies, persists day andnight, and is actively motile. The Filaria ozzardi foundin British Guiana, and a large species, the Filaria gigas,has been found at Sierra Leone. The first two forms,viz., nocturna and diurna, are the only ones of clinicalimportance. Filaria nocturna is found in all tropical and many subtropicalcountries. Most of those observed in the northern part of this country are Three chiefforms. of Fig. 563.—Filarianocturna in blood. FILARIASIS—ELEPHANTIASIS I 141 imported cases. In certain tropical regions 70 per cent, of the populationof certain villages may be affected. Morphology {Filaria nocturna).—The parent worm inhabits the lymphchannels, the embryo the circulating blood, the body of the mosquito servingas intermediate host. The adult form is from 3 to 4 inches in length and ofthe thickness of a fine thread. The embryo is }£q inch in length and about
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
