TRYPANOSOMAS, TRYPANOSOMIASIS, AND 
'SLEEPING SICKNESS' 
H . W . THOMAS 
J. H. TODD MEMORIAL FELLOW 
AND 
ANTON BREINL 
I. DESCRIPTION OF CASES OF SLEEPING SICKNESS IN MAN 
OPPORTUNITY was afforded for study by the arrival in England of natives 
from the Congo Free State suffering from 'sleeping sickness' or ' Trypanosome 
Native Fever.' It is due to the courtesy of the authorities of the Congo Free 
State that facilities were given to the members of the Congo Expedition of our 
School to send to England selected cases of the disease. Special importance was 
placed on observations being made for a prolonged period in England where the 
change of climate, the regular life, and the general attention given to strengthening 
their systems might produce some effect on the disease. The cases observed were : — 
Of ' Sleeping Sickness ' 
Of ' Trypanosomiasis ' 
('Trypanosome Fever') 
Boyo 
Mpangila 
Kit am bo 
Disasi 
Tomi 
Banja 
One European 
Capt. ' s. B.' 
It is not our purpose to discuss clinically whether 'Trypanosome Fever' cases 
are cases of early sleeping sickness or represent a distinct disease — this is left to the 
members of our Congo Expedition who have had opportunity of comparing several 
hundreds of cases. All the sleeping sickness cases died, the native ' Disasi ' succumbed 
to pneumonia. Clinical histories of cases of trypanosomiasis in man have been so 
frequently recorded that a minutely detailed report of each case would serve no 
purpose. 
