226 Trypanosome causing Disease in Man in Nyasaland. 



Experiment 17, Monkey 970, Wild G. morsitans Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



D U2" tl 1 1 1 1 OT* 



dise&se in 

 cLei^s j or 

 recovery. 



1912. 













July 24... 



970 



From Eat 658 



Wild G. morsitans 



8 



E. 



1913. 













Jan. 2... 



970 



From Eat 1664 



Wild G. morsitans 







„ 17... 



970 



From Eat 1740 



Wild G. morsitans 







Feb. 4... 



970 



From Eat 1814 



Naturally infected 



9 



E. 









Dog 48 







„ w.. 



970 



From Eat 1945 



Naturally infected 













Dog 48 







March 15... 



970 



From Guinea-pig 1657 





9 



71 



Remarks. — Monkey 970, after recovering from the Wild G. morsitans strain, shows a reaction 

 to Naturally Infected Dog Strain 4S, and finally succumbs to a Human strain. 



Conclusion. — The Wild G. morsitans strain does not protect against the Naturally Infected Dog 

 strain, nor does the combination of the two against the Human Strain V, Chibibi. 



Experiment 18, Dog 602, Wild G. morsitans Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1912. 

 May 31 ... 

 Nov. 22 ... 



602 

 602 



Wild flies 



Wild G. morsitans 

 Human 



5 

 6 



E. 

 28 



From Guinea-pig 1333 





Remarks. — Dog 602, which had recovered from the Wild G. morsitans strain, when inoculated 

 with a Human strain died in 28 days. 



Conclusion.— The Wild G. morsitans strain does not protect against the Human Strain IV, 

 Chipochola. 



Conclusions. 



1. The Naturally Infected Dog strain does not protect animals from the 

 Human, Wild G. morsitans, and Zululand, 1913, strains. 



2. The Wild G. morsitans strain and the Naturally Infected Dog strain do 

 not protect animals from the Human or the Zululand, 1913, strain. 



3. The Wild G. morsitans strain does not protect against the Human 

 strain. 



4. In spite of the damaging evidence of these experiments, the Commission 

 still holds the opinion that the Naturally Infected Dog strain is a weak 

 strain of the trypanosome causing disease in man in Nyasaland, T. brucei 

 vet rhodesiense. 



