220 Sir D. Bruce and others. Trypanosome 



Experiment 1, Dog 459, 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 ... 



459 



From Dog 317 



Naturally infected 



19 



E. 









Dog 48 







Nov. 22 ... 



459 



From G-uinea-pig 1333 



Human 



4 



59 



Remarks. — Dog 459, which had recovered from Naturally Infected Dog Strain 48, when 

 inoculated with a Human strain died in 59 days. 



Conclusion. — The Naturally Infected Dog strain does not protect against the Human Strain IY, 

 Chipochola. 



Experiment 2, Monkey 1792, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1913. 













Jan. 22 ... 



1792 



From Eat 1741 



Naturally infected 



5 



'El 









Dog 48 







June 24 ... 



1792 



From Eat 2167 



Naturally infected 













Dog 2033 







July 12 ... 



1792 



From Eat 2235 



Human 



9 



61 









Remarks. — Monkey 1792, which had recovered from Naturally Infected Dog Strain 48, and 

 proved immune to Naturally Infected Dog Strain 2033, succumbs to the Human strain. 



Conclusion. — The Naturally Infected Dog strain does not protect against the Human strain, 

 Yoramu. 



Experiment 3, Monkey 1793, Naturally Infected Dog Strain. 



Date. 



Expt. 



c, e ■ Strain of 

 Source 01 virus. , 



trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1913. 

 Jan. 22 ... 



June 24 ... 



July 12 ... 



1793 

 1793 

 1793 



From Eat 1741 



Naturally infected 



Dog 48 

 Nat urally infected 



Dog 2033 



5 



5 



E. 

 9 



From Eat 2167 



From Bat 2235 







Remarks. — Monkey 1793, which had recovered from Naturally Infected Dog Strain 48, and 

 proved immune to Naturally Infected Dog Strain 2033, succumbs in nine days to the Human 

 strain. 



Conclusion. — The Naturally Infected Dog strain does not protect against the Human strain, 

 Yoramu. 



