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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    T. Evansi from the peri[)heral circulation of the animal, a large form of trypansoma was observed, which exhibited a length many times that of the smaller species of flagellate. It exhibited a somewhat similar outline to that observed in the bull, previously mentioned, and the body movements were the same, but no undulating membrane could be made out. Although the blood was carefully examined micros- copically twice a day up to the 9th February 1893, no further example of the giant form of flagellate was discovered ; the small variety, however, made its appearance twelve days after the above observation was made. On the 9th February 1893, the animal under experiment was re-inoculated subcu- taneously with 2'0 c. c. of blood containing numerous trypano- somata drawn immediately after death from the jugular vein of a horse, a case of spontaneous equine Surra. The T. Evansi appeared in the circulation after an incubation period lasting ten days. Six paroxysms of the disease followed of 1, 1, 2, 1, 1 and 2 days, and five intermissions of 10, 29, 70, 9 and 36 days respectively. From the date of the last paroxysm, October 28th, 1893, observations were maintained dail}^ for a further period of 203 daj^s, viz., to the 19th March 1894, but the small variety’ of trypanosoma did not reappear in the blood. The second occasion on wliich a single example of the giant trypanosoma was observed in the specimens of blood taken from this animal, was on 15th June 1893, 127 days after re-inoculation. Two guinea-pigs, each inoculated with 0'5 c. c. of blood direct from the cow, contracted trypano- somiasis (Surra) after two days’ incubation, and death followed in nine and seven days respectively, but no examples of the large flagellates were discovered in their circulations, although carefully searched for in the blood and tissues of the organs and marrow of the bones. The third observation of the giant trypanosoma was made on the 3rd July 1893, when again a single example was discovered. The fourth observation occurred on the 2nd Se[)tember 1893, during the prolonged aixsence of the small variety. Microscopical observa- tions with regard to the condition of the V>lood were continued daily for a further period of 271 days, Init neither the large, nor the small forms of tiypanosomata, were again encountered.