INTESTINAL PARASITES IN EAST AFRICA 471 
among those tribes of which numbers over twenty-five were 
examined : — 
Table showing Percentages of Infections among those Tribes of which 
NUMBERS OYER TWENTY-FIVE WERE EXAMINED 
The Nubi are here included to show the high degree of Bilharzial infection among them. 
— 
Wa-G-anda 
Wa- 
Kavirondo 
Wa-Kamba 
Wa-Kikuyu 
Wa-Kisii 
Wa-Nubi 
*3 
<D 
' & 
fe a 
[25 
Wa-Somali 
Wa-Swahili 
Total other 
EastAfricans 
No. of individuals! 
examined . J 
25 
166 
44 
91 
61 
13 
39 
21 
107 
103 
Infections — 
A. duodenale 
24-0 
18-0 
29-5 
36-2 
29-5 
15-3 
48-7 
23-8 
44-8 
320 
A. lumbricoides 
12-0 
39-1 
22-7 
39-5 
29-5 
15-3 
230 
23-8 
18-6 
26-2 
T. dispar 
28*0 
331 
23-0 
30-7 
27-7 
33-0 
41-0 
33-3 
47-6 
3-30 
T. saginata 
16-0 
25-9 
18-1 
24-1 
229 
7-6 
12-8 
14-2 
8-4 
9-1 
Schis. Mansoni . 
12-0 
3-0 
6-8 
— 
— 
30-7 
2-5 
— 
1-8 
5-8 
Double infections . 
24-0 
19-8 
20-4 
18-6 
22-9 
15-3 
28-2 
28-5 
25-2 
20-3 
Triple „ 
4-0 
8-4 
6*8 
12-0 
131 
— 
12-8 
4-3 
8-4 
7-7 
Quadruple ,, 
— 
2-4 
— 
4-3 
— 
— 
2-5 
— 
— 
— 
Quintuple „ 
It is not, of course, suggested that figures deduced from 
examinations, varying between 25 to 150 members of any 
one tribe, examined at a distance from their homes, can be 
taken as an index of the general and tribal distribution of 
helminthiasis in East Africa. Nevertheless, curiously enough, 
in nearly every instance in which the distribution of a disease 
was previously known, an examination of the last table shows 
that the natives from those areas return a proportionately high 
rate of infection to a remarkable degree. For example, 
bilharzia is well known on the Upper Nile, and a reference 
to the table immediately shows true by recording a high 
percentage figure for the tribes therefrom : the Nilotic Nubi 
giving a return of no less than 80*7 per cent. 
It has also been recognised for some time past that the 
natives settled in the Nyika country, along the course of the 
Kibwezi and Sabaki rivers, are infected with the same disease, 
