Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . to12,000 or more and show noth-ing differentially abnormal, ex-cept a slight increase of the largelymphocytes.(9). Distomiasis (Bilharziasis). This is a chronic parasiticdisease due to the deposition in thetissues of the eggs of the worm,Schistosomum hematobium, alsocalled Bilharzia hematobia, gyne-cophorus, distomum hematobium,distoma capense, and is a very common condition inAfrica, but has been found but six times in America, according to appears to be
Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . to12,000 or more and show noth-ing differentially abnormal, ex-cept a slight increase of the largelymphocytes.(9). Distomiasis (Bilharziasis). This is a chronic parasiticdisease due to the deposition in thetissues of the eggs of the worm,Schistosomum hematobium, alsocalled Bilharzia hematobia, gyne-cophorus, distomum hematobium,distoma capense, and is a very common condition inAfrica, but has been found but six times in America, according to appears to be more commonly induced by drinking unfiltered infectedwater, but occasionally it may come through the skin. The adult parasites inhabit the blood of the portal vein and the vesselsof the pelvis, rectum, and bladder. The male is smaller and thicker than thefemale, is 12 to 15 mm. long and i mm. broad, is flat and so folded as to forma gynecophoric canal which holds the female. The female is about 20 and mm. thick and is the active agent in the Jour. A. M. A., vol. 52, 1909, p. Fig. 150.—Schistosomum hematobium; malewith female in gynecophoric groove. {Tysonafter Loos.) THE BLOOD. 559 The eggs of the parasite are oval or spindle-shaped, measure about in length and mm. in breadth, and have a distinct spine-like projectionfrom the posterior end or from one side. These ova are particularly frequent inthe urine of such cases. Occasionally they may be found in the circulatingblood. VI. Bacteriology of the Blood. In a clinical analysis, it is frequently necessary to make examinations ofthe blood for the presence of various bacteria. Such an examination requiresa rather minute knowledge of the methods of bacteriology, but the writer can-not take space to outline such procedures. It is occasionally desired to makecultures from the blood in suspected cases, so that a few words seem advisable. Blood Cultures. For the ordinary blood culture the a
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