Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . d Bradford, 1894) causes nagana, or tsetse-fly disease, a disease affecting horses,cattle, and dogs in certain regions of South Africa. ThetrjTpanosome of Bruce is less motUe than that of Lewis. Ithas been cultivated at 25° C, and is less resistant to laboratory animals subject to infection. The rat dies inten days. In the natural infection Bruce discovered that the tsetse-fly transmitted the disease, but that it did so by first bitingsome animal whose blood co
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . d Bradford, 1894) causes nagana, or tsetse-fly disease, a disease affecting horses,cattle, and dogs in certain regions of South Africa. ThetrjTpanosome of Bruce is less motUe than that of Lewis. Ithas been cultivated at 25° C, and is less resistant to laboratory animals subject to infection. The rat dies inten days. In the natural infection Bruce discovered that the tsetse-fly transmitted the disease, but that it did so by first bitingsome animal whose blood contained the trjrpanosome. The PROTOZOA 207 blood of infected animals contains the organism, and can, ifinjected, produce the disease without the agency of the far the tsetse-fly alone is responsible for the spread of theinfection. Sleeping Sickness.—^Trypanosoma Ugandense Gam-biense (Button, 1904).—(T. Castellani, T. Hominis, )—Sleeping sickness, or human trypanosomiasis, is adisease peculiar to some parts of Africa. It is accompaniedby periods of fever, anemia, and, finally, a lethargy deepening. Fig. 105.—Trypanosome from blood of gray rat; stained with a 2 percent, aqueous solution of methylene-blue (Boston). into coma and death. The disease may be rapid, and itmay last with recurrences for many yeirs. Tj-ypanosomesidentical with those found in nagana disease have beenfound in the blood of infected persons, and described byvarious observers, and given different names. Monkeys, when inoculated with cerebrospinal fluid fromaffected persons, develop a similar disease, and the parasitesare found in the blood. So far the organism has not beencultivated. 2o8 ESSENTIALS OF BACTERIOLOGY A blood-sucking fly, known as the Glossina palpalis, is con-sidered the means of infection. The fly is closely related tothe Glossina morsitans, or tsetse fly. The sleeping sickness inman is most likely the same thing as the nagana of cattle. Methods of Examinations.—From
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