16 
of an infection as measured, not by the clinical symptoms, but by the 
number of worms present in the intestine (as indicated by the number 
of ova in the feces), the negroes were as severely infected as the whites; 
7S— per cent of 13,219 white patients showed a great many, many, 
or a moderate number of hookworm ova in the feces: 21+ per cent 
showed few or very few ova. Of 673 negro patients, 76+ per cent 
showed a great many, many, or a moderate number of hookworm ova 
in the feces: 23+ per cent showed few or very few ova. These data, 
while showing conclusivelv that uncinariasis is a severer disease in 
whites than in negroes, do not indicate that there is any greater pre- 
disposition on the part of whites to hookworm infection and strengthen 
rather than weaken the conclusion indicated in our own results, 
namely, that hookworm infections are possibly more common among 
negroes than among whites. 
SEX. 
Among the whole number of persons examined (3,457), females were 
more frequently infected than males, as follows: 
Examined. 
Infections. 
Per 190 
persons. 
Males 
2,311 
247 
10.68 
Females j 
1,146 
139 
12.13 
Considering each species of parasite separately, a higher rate of 
infection was present among female patients in the case of whip- 
worms, of eelworms, and of the fat tapeworm; the other worms pre- 
sented a higher percentage of infection among male patients: 
Examined. 
Infections. 
Per 100 
persons. 
Trichuris trichiura: 
Males 
2,311 
149 
6.45 
Females 
1,146 
117 
10.21 
Oxyuris vermicularis: 
Males 
2,311 
38 
1.64 
Females 
1,146 
/ 
0.61 
Hookworms: 
Males 
2,311 
33 
1.43 
Females 
1,146 
3 
0.26 
Ascaris lumbricoides: 
Males 
2,311 
8 
0.35 
Females 
1,146 
_ 9 
0.79 
Strongyloides stercoralis: 
Males 
2,311 
i 
0.30 
Females 
1,146 
1 
0.09 
Hymenolepis nana: 
Males. 
2,311 
11 
0.48 
Females 
1,146 
1 
0.09 
Taenia saginata: 
Males 
2,311 
1 
' 0.04 
Females 
1,146 
1 
0.09 
