causing Disease in Man in Nyasaland. 223 



Experiment 10, Goat 432, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration ot 

 disease, in 

 days, or 

 recovery. 



1912. 













April 20 ... 



432 



From Rat 392 



JNaturally infected 



26 



T > 



±V. 







Dog 48 







1913. 













Jan. 22 ... 



432 



From Eat 1741 



Naturally infected 













Dog 48 







Feb. 11 ... 



432 



From Bat 1735 



Naturally infected 













Dog 48 







Feb. 28 ... 



432 



From Dog 1906 and 



Zululand, 1913 



•31 



143 







Rat 1832. 









Remarks. — Goat 432 has recovered from Naturally Infected Dog Strain 48, but succumbs to 

 T. brueei, Zululand, 1913. 



Conclusion. — The Naturally Infected Dog strain does not protect against T. brueei, Zululand, 

 1913. 



Experiment 11, Sheep 456, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



Strain of ■ 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1912. 













April 20 ... 



456 



From Rat 392 



Naturally infected 



5 



R. 







Dog 48 







1913. 













March 21... 



456 



From Rat 1991 



Naturally infected 













Dog 48 







1914. 













Jan. 7 



456 



From Rat 2470 



Zululand, 1913 



10 



Alive 1.3.14 







Remarks. — Sheep 456 has recovered from Naturally Infected Dog Strain 48, but reacts when 

 exposed to the virus of T. brueei, Zululand, 1913. 



Conclusion. — The Naturally Infected Dog strain does not protect against T. brueei, Zululand, 

 1913. 



Experiment 12, Dog 1253, Naturally Infected Dog Strain. 



Date. 



Expt, 



- 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1912. 

 Sept. 6 



1913. 

 Jan. 4 ... 



1253 



From Rat 1218 



Naturallv infected 



6 



R. 



1253 



From Rat 1570 



Dog 48" 



Naturally infected 



Dog 48 

 Naturally infected 



Dog 48 

 Zululand, 1913 



5 



R. 



Jan. 17 



1253 



From Rat 1734 







Feb. 28 ... 



1253 



From Dog 1906 and 

 Rat 1832 • 



6 



48 



Remarks. — Dog 1253 has recovered from Naturally Infected Dog Strain 48, but succumbs to 

 T. brueei, Zululand, 1913. 



Conclusion. — The Naturally Infected Dog strain does not protect against T. brueei, Zululand, 

 1913. s 2 



