44 
This greater frequency of infection among the foreign born exists 
despite the fact that the native born included 396 negroes, among 
whom, as already shown, the rate of infection is particularly high. 
Among whites alone the statistics of total infection for native and 
foreign born were as follows : 
Examined. 
Infections 
Per 100 
persons. 
Native born 
1,637 
1,020 
153 
117 
9.35 
11.47 
Foreign born 
The frequency of infection with intestinal worms is seen, therefore, 
to be greater among foreign-born whites than among native-born 
whites by over 2 infections per 100 persons. 
The various species of worms occurred in native and in foreign born 
whites as follows : 
Examined. 
Infections. 
Per 100 
persons. 
Trichuris trichiura: 
Native born 
1,637 
104 
6.35 
Foreign born 
Oxyuris vermicularis: 
1,020 
87 
8.53 
Native born 
1,637 
23 
1.41 
Foreign born 
1,020 
14 
1.37 
Hookworms: 
Native born 
1,637 
14 
0.86 
Foreign born 
1,020 
8 
0.78 
Ascaris lumbricoides: 
Native born 
1,637 
3 
0.18 
Foreign born 
1,020 
7 
0.69 
Strongyloides stercoralis: 
Native born 
1,637 
8 
0.49 
Foreign born 
1,020 
0 
0.00 
Hymenolepis nana: 
Native born 
1,637 
0 
0.00 
Foreign born 
1,020 
0 
0.00 
Tsenia saginata: 
Native born 
1,637 
1 
0.06 
Foreign born 
1,020 
1 
0.10 
From the above figures it is evident that the higher rate of total 
infection among persons of foreign nativity was due largely to the 
greater frequency of whipworm infections which they presented; eel- 
worm infections also gave a higher rate per cent among the foreign-born 
patients. Pinworms, on the other hand, presented a slightly greater 
frequency among patients of native birth, and the 8 infections with 
Cochin China worms all occurred among the native born. 
