INTESTINAL PARASITES IN EAST AFRICA 469 
show the percentages by classes, combined and individual, 
for the five chief infections : — 
Total .... 
Positive 
Negative 
Ankylostoma duodenale 
Ascaris lumbricoides 
Trichocephalus dispar . 
Tcenia saginata 
Schistosoma Mansoni . 
Oxyuris vermicularis 
Hymenolepis diminuta . 
Schistosoma hcematohium 
Strongylus subtilis 
Hymenolepis nana 
Strongyloides stercoralis . 
Double Infections 
Triple Infections . 
Quadruple Infections 
Quintuple Infections 
Total. 
Indians. 
Africans. Arabs. 
1500 
728 
689 
63 
778 
231 
495 
52 
722 
497 
194 
31 
347 
110 
208 
29 
270 
63 
195 
12 
313 
49 
235 
29 
168 
41 
120 
7 
29 
1 
24 
4 
2 
1 
— 
1 
1 
— 
— 
1 
3 
— 
2 
1 
4 
3 
1 
— 
2 
1 
1 * 
— 
2 
— 
2 
— 
197 
34 
146 
17 
63 
3 
54 
6 
10 
— 
9 
1 
1 
— 
1 
— 
Indians, Arabs, and Africans combined 
Per cent. 
Ankylostoma duodenale (Positive) . .23*1 
Ascaris lumbricoides . . . . .18-0 
Trichocephalus dispar . . . . .20*8 
Tcenia saginata . . . . . .11*2 
Schistosoma Mansoni . . . . .1*9 
Double Infections . . . . .13-1 
Triple Infections ..... 4*2 
Quadruple Infections . . . . .0*6 
Quintuple Infections . . . . .0-06 
* This infection occurred in one of the nineteen Cape boys mentioned beloWi 
