208 
TYPHOID FE\T:E in DISTRICT OF COLUMBIA. 
It will thus be seen that we have, in our 200 cases examined, a 
slight excess of males and negroes and a slight deficit in whites and 
females, when compared Yuth the total population of the District of 
Columbia. It should, however, be recalled that our examinations were 
made from the latter part of July to the first week in September, 
inclusive, and that because of the severe and trying climate of these 
months in Washington, there is quite an appreciable change in the pro- 
portions of whites to negroes and males to females, due to the exodus 
of many of the inhabitants who desire to escape this hot season; the 
financial condition oi the inhabitants naturally results in a greater 
exodus among the whites than among the negroes, and the ofiicial 
and business duties devolving upon the men naturally result in a 
greater exodus of women than of men. 
The division of the cases, therefore, corresponds approximately to 
the division of the general population, hence it forms a fair basis for 
studv. ' 
Stiles & Garrison (1906a, 13-14) have shovm that 746 whites 
admitted to the Government hospital from the District of Columbia 
showed an average intestinal helminthiasis of 4.96 per 100 persons, and 
an average of 3.75 per cent, infection with whipworms; also, that 378 
corresponding negroes presented an average of 12.43 per 100 persons 
of general intestinal helminthiasis, and 9.79 per cent, infection with 
whipworms. The approximate number of infections which might 
occur among our 200 patients, without causing any surprise, would 
thus be as follows: 
Race. 
Total intestinal 
Infection with 
helminthiasis. 
.whipworms. 
WLites 
136X 4.96=6.7456 
136X 3. 75= 5. 1000 
Negroes 
64X12.43=7.9552 
64X 9.79= 6.2656 
Total 
14 7008 
11. 3656 
Thus we might expect among our 200 patients, 14.70 cases of intes- 
tinal helminthiasis and 11.36 cases of whipworms, without giving us 
any ground for assuming that the intestinal worms had anything to 
do vfith the typhoid infection, either directly or indirectly. As a 
matter of fact, we might expect even a slightly higher number of infec- 
tions than these figures indicate, for this has been an unusually wet 
year, hence one favorable to whipworm and ascaris infections. 
