Morphology of various strains of the trypanosome causing disease in man in Nyassaland : the mzimba strain / by Sir David Bruce [and others].

Date:
1913?]
Catalogue details

Licence: Public Domain Mark

Credit: Morphology of various strains of the trypanosome causing disease in man in Nyassaland : the mzimba strain / by Sir David Bruce [and others]. Source: Wellcome Collection.

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    disease in man. That the cause of the sparsity of cases in man in these areas is due to the fact that man is more or less refractory to the trypano- some, and that it is only rarely that the “fly” meets with a susceptible subject. That this is the reason why the cases of Human trypanosome disease in the Luangwa valley and in Nyasaland do not tend to increase in numbers. The disease remains stationary, as it probably has done during the last thousand years. This is the working hypothesis held at present by this Commission. These, then, are the points at issue, and it would appear at present that the only way of solving the problem will be by searching and finding out whether cases of 7’. brucei disease, cr Nagana, in man occur wherever G. morsitans and this parasite are found together. Already cases have been found on the Rovuma river on the borders of German and Portuguese East Africa, and in the Hartley District south of the Zambesi, in Europeans and natives, who certainly could only have contracted the disease in these widely separated districts. Thanks to Mr. Garden, the Government Veterinary Officer, the Commis- sion have had the opportunity of studying a trypanosome of the Nagana type found in the blood of a donkey at Mzimba (lat. 11° 55’ S., long. 33° 35” E.), about 100 miles north of the northern border of the Proclaimed Area. It is proposed, then, in this paper to describe this trypanosome, in pursuance of the policy of describing in detail as many strains as possible of this type of trypanosome, if peradventure some method of separating 7. brucer from TL. rhodesiense may be discovered, or of proving them to be one and the same species. MorPHOLOGY OF THE MZIMBA STRAIN. A. Lwing, Unstarned. The movements of this trypanosome in the living condition are similar to T. brucer and T. gambiense in being non-translatory. B. Fixed and Stained. The blood films were fixed, stained and measured as previously described in the “ Proceedings.””* _
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