77 
THE INCIDENCE AND PROPHYLAXIS OF 
HUMAN TRYPANOSOMIASIS IN NORTH 
EASTERN RHODESIA 
BY 
ALLAN KINGHORN, M.B, Toronto, 
JOHNSTON COLONIAL FELLOW, UNIVRRStTV OK LIVERPOOL 
AND 
R. EUSTACE MONTGOMERY, M.R.C.V.S. 
(First intervH report of the Expedition of the Liverpool School of 
Tropical Medicine to the Zambesi, igoy-o 8 ) 
When the Expedition to the Congo returned to England in the 
autumn of 1905, Dr. Todd stated that there was reason to fear an 
extension of human trypanosomiasis from the Congo Free State into 
British territory. This statement was based principally on the facts 
that the disease was spreading steadily southwards, that imported 
cases of sleeping sickness existed practically on the borders of 
Rhodesia, at Moliro and Baudoinville on Lake Tanganyika, and that 
one of the main trade routes ran from this lake to Nyassa. I'he history 
of the spread of the disease in the Congo showed that it had been 
carried from point to point along the main caravan roads, often with 
startling rapidity. 
In the following year, reports were received that an imported case 
existed at the Belgian post of Kasenga on the Luapula River, and in 
September, 1906, Dr. Todd and one of us were informed by Mr. F. W. 
Arnott, of the Garanganza Mission, that cases were present at Lukafu 
on the Lufira River. In November, Dr. Todd received from 
Dr. Massey, then of the Tanganyika Concessions, Limited, a 
communication stating that the disease was endemic in the villages 
around Lake Kisale and some of its confluents, and further, that about 
9 per cent, of the carriers from Kabinda to Ruwe were infected 
(When Dr. Todd went through this part of the Congo, he found that 
about 13 per cent, of the people in the neighbourhood of Kabinda 
were infected, but that fish sellers from the South, whom he saw there, 
were free from the disease.) In about a year and a half then, June 
