Different species of trypanosomata observed in bovines in India / by A. Lingard.

  • Lingard, Alfred.
Date:
1907
Catalogue details

Licence: In copyright

Credit: Different species of trypanosomata observed in bovines in India / by A. Lingard. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    4U part of the body, as pointed out by McCallum in the Halteri- dium. in birds, and by Schaudinn in the metamorphosis of male, female and indifferent obkinets in T. Noctuce. In the same specimens and in addition to the forms just mentioned, crescent-sha]3ed bodies were encountered 14'76 to 16'40)ti in length by 4-10 to 4'92m in breadth, almost symmetrical in contour, with rounded extremities, one being free from endoplasm, while a short distance from the other a large circular open nucleus 3'28 to 4*92i“ in diameter, composed of a number of chromatin particles, was situated. This form of organism exhibited few, if any, micro-gramdes in its endoplasm, but the protoplasm was coarsely alveolar in structure. ((/) I have on several occasions observed crescent, shaped bodies, resembling those of Laverania malarice, in the blood of cattle in Poona, in Surra Bull I during the year 1892, and also in Karnal bullock No. 13 in 1895, the contours of which resembled those depicted in PI. II, Fig. 20 ; and in each instance the animal was the host of a large species of trypanosoma. Holmes, as previously noted, observed numerous large crescent forms in the blood taken from two infected bulls. These bodies stained blue and contained numerous chromatin granules. In each instance in the illustra- tions furnished, these forms are more or less rounded at one extremity, while the other is somewhat narrower and pointed. Hunt, quoted by Minchin, “ found crescents in the blood of cattle (Texas fever) and has observed their change into a spheroidal shape, but while comparing these bodies to the crescents of the malarial parasites, he at the same time regards them as a form of sporulating body producing spores endogenously having mistaken the coarse granules in them for minute spores.” These crescent forms, above described, are frequently co-existent with the Piroplcmna higemmum, or the smaller form in the blood of Indian cattle. .Possibly the presence of the crescents in Queensland bovines may point to the fact that these animals in some instances are also the hosts of a large form of trypanosoma, which up to the present has not been demonstrated in their blood. Prowazeh remarks in connection with his work on the Try- panosoma Lewisi that in general these forms are not very frequently met with in Saugetiere. They are directly