The earth in relation to the preservation and destruction of contagia : being the Milroy lectures delivered at the Royal College of Physicians in 1899, with other papers on sanitation / by George Vivian Poore.

  • Poore G. V. (George Vivian), 1843-1904.
Date:
1902
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Licence: In copyright

Credit: The earth in relation to the preservation and destruction of contagia : being the Milroy lectures delivered at the Royal College of Physicians in 1899, with other papers on sanitation / by George Vivian Poore. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    TRYPANOSOMA Tsetse Fly Disease Kanthack, Durham, and Blandford' have shown that Ngana or tsetse fly disease is due to a haematozoon (trypanosoma) in the blood inoculated by a fly. Cats, dogs, mice, rabbits, rats, hedgehogs, donkeys, horses, and their hybrids seem susceptible. The disease appears to be communicable only by some form of inoculation and is not probably conveyed by feeding on infective material in the absence of superficial lesions. Material taken from the dead body twenty-four hours after death is not infective. The nearest lymphatic glands to the inoculated spot are the first to suffer. The heematozoon gets through the lymphatics to the blood. In the late stages of the disease the animals (especially dogs) may become infected by pyococci, i.e. a spon- taneous infection to which the animal is rendered prone by its marasmus. The blood may contain 3,000,000 haematozoa per millimetre, or may prove infective though none be visible. The trypanosoma sanguinis which is found in a certain proportion of rats has no apparent relation to tsetse fly disease. A similar parasite is said to cause ' surra ' in India and an allied disease among horses in Algeria. Surra is probably conveyed by flies. Lingard thinks the fodder soiled with rat-dung may give the disease, but that is doubtful. The tsetse fly is a dipterous insect somewhat resembling the common house fly. It has a long thin proboscis, chestnut thorax marked longitudinally by four black lines, and a yellowish-white abdomen of five rings. It inhabits principally the low-lying and swampy valleys of the Zambesi and Chobe. ' Proceedings of the Royal Society, vol. Ixiv. p. 100.