— 338 — 
Percentage of infection in native males : 
Number of patients examined, 168. 
Négative examinations of stools . 
Hookworm infections. 9‘ib 
Whipworm infections. 38,5 
Roundworm infections .. 
Slrongyloides infections .. .. 22,0 
Oxyuris infections . ... 2, 
33.3 % 
of ail stools examined. 
9‘ib 
d° 
38,5 
d° 
2,9 
d° 
22,0 
d° 
2.3 
d° 
Percentage of infection in native females : 
Number of patients examined, 117. 
Négative examinations of stools . 
Hookworm infections . 
Whipworm infections. 
Roundworm infections . 
Strongyloides infections . 
Oxyuris infections.•. 
54.9 
3 i / 
£ of ail sto< 
27,8 
d° 
5 N 6 
d° 
4>9 
d° 
J 4>9 
d° 
0,8 
d° 
Percentage of infection among non-natives, chiefly Spanish 
laborers and a few other Europeans, ail males : 
Number of patients examined, 31. 
Négative examinations of stools . °/ Q of ail stools examined. 
Hookworm infections . 
. 25,8 
d° 
Whipworm infections. 
d° 
Roundworm infections . 
......... 3,2 
d° 
Strongyloides infections . 
d» 
Oxyuris infections. 
d° 
Percentage of infection in natives over 50 years of âge : 
Number of patients examined, 22. 
Hookworm infections . 
% of ail stools examined. 
Whipworm infections. 
d° 
Roundworm infections . 
d° 
Strongyloides infections . 
d° 
Oxyuris infections. 
» 
The absence of round worms and the increased number of in¬ 
fections by S. stercoralis is noteworthy. This, together with fin- 
dings in other cases, indicates that roundworm infections are oft- 
enest met with during adolescence, while Strongyloides infec¬ 
tions hâve a tendency to persist throughout life. 
Percentage of single and multiple infection: 
Number of infections 
Single 
Double 
Triple 
Quadru¬ 
ple 
Total 
Hookworm infections. . 
35 
54 
28 
1 
118 
Whipworm infections. 
53 
56 
29 
1 » 
1 39 
Roundworm infections. 
4 
4 
1 
12 
Strongyloides infections 
*3 
18 
26 
0 
57 
Oxyuris infections. 
2 
2 
3 
1 
8 
