68 
Trypanosomiasis of Camels 
The binuclears fell immediately after infection to 8*5 % and later never 
rose above 10*3 %; the lowest percentage was on the last day—2-3 %. The 
curve of these elements exhibited a fall. 
The trinuclears all the time kept falling, and later disappeared altogether 
from the blood. 
This fall and disappearance was still more definitely expressed in the 
tetranuclears, which were absent from the blood during 18 of the 36 days of 
infection. 
Thus, in this dog, the “shift to the left'’ of the Arneth index was dis¬ 
tinctly expressed. 
Summarising these data, we may state that in the dog infected with the 
trypanosome of the Bokhara camels, the changes in the formed elements of 
the blood observed by us are as follows: 
(1) Oligocythaemia. 
(2) (a) Primary leucocytosis, ( b) relative leucopenia, and (c) secondary 
leucocvtosis, and 
(3) “Shift to the left” of the Arneth index. 
The general picture of the life of the blood elements may be divided into 
three periods: 
First period. From the beginning of infection till the first appearance of 
trypanosomes in blood. 
Characteristic. Primary leucocytosis. Polynucleosis. Decrease in the 
percentage of lymphocytes. Beginning of the “shift to the left” of the 
Arneth index. Beginning of the decrease in the number of red blood corpuscles. 
Second period. From the second period to the third. 
Characteristic. A tendency towards a decrease in the total number of 
white blood corpuscles. A tendency towards an increase in the percentage 
of lymphocytes and towards a decrease in neutrophils. The Arneth index 
“shifts to the left.” The number of red blood corpuscles falls. 
Third period. Several days before and up to death. 
Characteristic. Secondary leucocytosis. Polynucleosis. Decrease in the 
percentage of lymphocytes and increase in neutrophils. “Shift to the left” 
of the Arneth index. Large fall of the red blood corpuscles. 
Thus, we see that in dogs infected with the trypanosome of Turkestan 
camels the life of the formed elements of the blood shows the same phenomena, 
which were observed by the authors in dogs infected with Trypanosoma 
brucei, T. equinum and T. gambiense. 
It is true, these phenomena are not so strongly expressed, as was the 
case in the observations of some authors (Yakimoff, Levi della A ida and 
Verdozzi), but we are inclined to explain this either by the difference of the 
trypanosomes, or by the method of infection. In general, however, the 
picture remains the same. 
