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Description of a Strain of Trypanosoma brucei from Zululand. 

 Part II. — Susceptibility of Animals. 



By Surgeon-General Sir David Bruce, C.B., F.Pi.S., A.M.S. ; Major A. E. 

 Hamerton, D.S.O., and Captain D. P. Watson, K.A.M.C. ; and Lady 

 Bruce, B.B.C. (Scientific Commission of the Koyal Society, Nyasaland, 

 1912-14.) 



(Eeceived February 24, — Read March 26, 1914.) 

 Introduction. 



In the foregoing paper the morphology of this trypanosome was described, 

 and the conclusion arrived at that it is identical, as regards shape, size and 

 general appearance, with the trypanosome causing disease in man in 

 Nyasaland, the Trypanosoma rhodesiense of Stephens and Fantham. 



This paper describes the action on animals of the Zululand trypanosome, 

 and it is compared in this regard with the Nyasaland species. 



Susceptibility of Animals to T. brucei, Zululand Strain, 1913. 



Table I. 



Date. 



No. of 

 expt. 



Source of virus. 



Incubation, 

 in days. 



Duration, 

 in days.* 



Remarks. 



1895. 



Sept. 27... 

 „ 29... 



37 



212 



235 





Horse. 



3 



? 

 6 



35 



30 

 49 



" Very old animal ; typical 



Nagana." — Shilston. 

 Zululand, 1896, Bruce. 



Average 





38 -0 



Ox. 



1913. 















22 





6 





" Still alive after 90 days."— 











Shilston. 



Feb. 18... 



1913 



Rat 1839 







Never showed trypanosomes. 



„ 18... 



1914 



„ 1839 



37 





Still alive after 316 days. 



„ 18... 



1915 





35 



310 



Died of T. brucei. 



July 22... 



2304 



Dog 2281 







Never showed trypanosomes. 



„ 22... 



2305 



„ 2281 







)> )> 



„ 22... 



2306 



„ 2281 







>> » 



Sheep. 



1 I Dog 4 1 12 — j " Still alive after 90 dayg." — 



| Shilston. 



* Duration includes the days of incubation ; it dates from day of infection. 



2 r 2 



