INTESTINAL WOKMS IN TYPHOID EEVEK. 
207 
ACKNOWLEDGMENTS . 
It is a pleasure to acknowledge my obligations to Doctor Wood- 
ward, health officer of the District of Columbia, for arranging for the 
collection of the material, and to Doctor Goldberger, Mr. Willets, and 
Mr. Paterson for their aid in the examination of the slides. 
SPECIES OF PARASITES FOUND IN THE STOOLS. 
Only two species of worms were found in the 200 patients 
examined. These were the whipworm (Trichuris trichiura) and the 
eelworm (Ascaris lumbricoides ) . In several preparations live or dead 
mites were found. While it is perhaps doubtful whether these mites 
would come into consideration in connection with the theory in ques- 
tion, mention will be made of them in the statistics. 
CONCURRENT INFECTIONS. 
In only one case was there a concurrent infection with whipworms 
and eelworms. All other cases infected with worms were infections 
with a single species. 
FREQUENCY OF INFECTION. 
Before giving the number of verminous infections actually found, 
it will be well to estimate the number (endemic helminthiasis) which 
might be expected in our 200 patients, independent of the question 
of typhoid. 
Endemic helminthiasis . — Our patients are classified as follows: 
Sex. 
Whites. 
Negroes. 
Total. 
Male 
77 
28 
105 
Female 
59 
36 
95 
Total 
136 
64 
200 
It will thus be seen that we had 68 per cent, whites, 32 per cent, 
negroes; 52.5 per cent, males, 47.5 per cent, females. 
The latest statistics on the population of the District of Columbia 
accessible to me (police census, spring of 1906) give the corresponding 
figures for the entire population as follows: 
Sex. 
Whites. 
Negroes. 
Total. 
Male 
113, 348 
118, 069 
43,955 
51,063 
157, 303 
169, 132 
Female 
Total 
231, 417 
95,018 
326, 435 
Thus, these statistics give 70.89 per cent whites, 29.10 per cent 
negroes, 48.18 per cent males, 51.81 per cent females. 
