Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . e thin portions of the smear. Thebody of the malarial parasite is stained blue, and its chromatina lilac to red color. The red cells are orange-pink. If possible, examinations for malarial organisms shouldalways be made before quinin is administered. Trypanosomata.—Trypanosomes are flagellate protozoafound in the blood of various animals, and causing a numberof diseases, such as surra, dourine, and nagana, affectinghorses and cattle, especially in tropical countries, an
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . e thin portions of the smear. Thebody of the malarial parasite is stained blue, and its chromatina lilac to red color. The red cells are orange-pink. If possible, examinations for malarial organisms shouldalways be made before quinin is administered. Trypanosomata.—Trypanosomes are flagellate protozoafound in the blood of various animals, and causing a numberof diseases, such as surra, dourine, and nagana, affectinghorses and cattle, especially in tropical countries, and causing PROTOZOA 205 the sleeping sickness of Africa, which is very fatal for humanbeings. About 60 species have been described, and 10 dis-eases are believed to be due to this form of organism. Morphology.—A fusiform mass, containing at one end aflagellum (Fig. 103). In the living state these protozoa are very motile. In thestained specimen chromatin granules are found and two ormore nuclei. From the smaller nucleus arises the undulatorymembrane, which passes into the flagellum and assists in thewave-like Fig. 103.—Pure culture of trypanosomes of mosquitos—Crithidiafasciculata. Part of roset of elongated crithidia witli flagella directedcentrally (Gen. 39 X 1500) (Novy, MacNeal, and Torrey). In the body fluids division occurs, first of the nucleus andthen of the protoplasm. Cultivation.—Novy and MacNeal have succeeded in culti-vating these protozoa on blood-agar, and multiplication goeson rapidly, so that rosettes are formed with the flagella ar-ranged around a common center. (See Figs. 102, 103, 104.) Trypanosoma Lewisi (Kent, 1878).—Found in rats byLewis; not fatal to them, though often equaling the red cor-puscles in number. It was one of the first of this group to 2o6 ESSENTIALS OF BACTEKIOLOGY be described. The infection continues for two months with-out producing any illness, and the animal is then immune. Injection of infected rat blood into heal
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