Diseases in animals (tick fever) : progress report on teh reproductive forms of the micro-organism of tick fever, with some observations on the relationships and nomenclature of that disease (16th December, 1897) / by J. Sidney Hunt.

  • Hunt J . Sidney.
Date:
[1897?]
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Licence: Public Domain Mark

Credit: Diseases in animals (tick fever) : progress report on teh reproductive forms of the micro-organism of tick fever, with some observations on the relationships and nomenclature of that disease (16th December, 1897) / by J. Sidney Hunt. 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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    EXTRACT FROM THE QUEENSLAND AGBICULTUEAL JOUBNAL, Vox,. II., Pabx 3. Diseases in Animals. (TICK FEVER.) PROGRESS REPORT ON THE REPEODHCTIVE FORMS OF THE MICRO-ORGANISM OP TICK FEVER, WITH SOME OBSER- VATIONS ON THE RELATIONSHIPS AND NOMENCLATURE OP THAT DISEASE. (lOxn December, 1897.) By J. SIDNEY HUNT, M.R.C.S. Eng. ON THE REPRODUCTIVE FORMS OF THE MICRO-ORGANISM OF TICK FEVER. The disease amongst cattle called, in Queensland, Tick Fever, has been shown to be, beyond question, identical with that which has long been known in the United States as Texas or Southern Cattle Fever.* * * § The same disease is, almost certainly, prevalent, under different names,f in various other parts of the world, notably the Argentine Republic, South Africa, Rouinjinia, and, perhaps, Java. Its geographical distribution is therefore very extensive, and its economic importance to the chief cattle-raising countries of the world by no means inconsiderable. From the standpoint of comparative pathology, moreover, the disease is of great interest and importance, because, as v\ill be presently further indicated, it has many points of suggestive analogy with one of the most widely prevalent kinds of malady that affect mankind—viz., malarial diseases. It is not here proposed to give any detailed account of tick or Texas fever, because this has already been done in a very complete and masterly way by Dr. Theobald Smith and F. Kilborne,J whose work has, moreover, been repeatedly verified both in the States§ and in Queensland.|| In order, however, to make clear the bearing of the observations which it is the purpose of this paper to record, it may be convenient to here briefly outline some of the more salient features and already ascertained facts in connection with the micro-organism of tick fever. Theobald Smith, in 1889, discovered^ that the remarkable bovine disease, whose nature had baffled all previous observers,** * * §§ was due to a blood-destroying microparasite belonging to the Protoson, which he named, from its physical characteristics, Pyrosoma ligeniinum. He, in conjunction with F. Kilborne, also determined the fact that the cattle tick {Ixodes Bovis) was the agent by which, in Nature, the disease is communicated.ff The micro-organism in question invades the blood corpuscles, and is also to be found free in the serum.§§ In the former situation it is very frequently, as its name implies, more or less pear-shaped, and paired.When free it is * Report on Texas or Southern Cattle Fever, by Theobald Smith and F. Kilborne; Eighth and Ninth Reports of Bureau of Animal Industry, U.S. Dept, of Agriculture, 1891-02. t For synonyms see note on page 220 of this Report. + Lon. cit. § Vide Bulletin 37 of Missouri Experiment Station. |l Report on Tick Fever, Queensland Government Printing Office, 189(i. ... Preliminary Observations on the Micro-organism of Texas Fever, by Theobald Smith, ^•O^JiMedical News, 21st December, 1889). 'Previous American literature of the subject, passivi. TT Loc cit. tt Vide Fig. II.