9 
The following table gives the frequency of infection with each 
parasite in each of the above classes: 
Table 4. — Frequency of infection u'ith reyard to length of residence in the hospital. 
Number of years. 
Num- 
ber 
exam- 
ined. 
Hook- 
'worms. 
Trichuris. 
Oxyuris. 
Sirongy- 
loides. 
{ Ascaris 
lumhri- 
' coides. 
Total, a 
No. 
Per 
cent. 
No. 
Per 
cent. 
No. 
Per 
cent. 
cent. 
No. 
Per 
cent. 
No. 
Per 
cent. 
-1 
162 
9 
5. 5 
26 
16. 09 
0 
0 
0 0 
1 
0. 62 
36 
22. 22 
1-3 
154 
4 
2.57 
18 
11.69 
0 
0 
3 1.95 
0 
0 
25 
16.23 
4-8 
57 
1 
1. 75 
5 
8. 77 
0 
0 
0 0 
1 
1.75 
7 
12. 28 
9-15 
45 
1 
2.22 
1 
2. 22 
1 
2.22 
0 , 0 
0 
0 
3 
6.66 
15+ 
71 
0 
0 
4 
5. 63 
3 
4. 23 
0 ; 0 
0 
0 
7 
9.86 
No record 
11 
0 
0 
0 
0 
0 
0 
0 ' 0 
0 
0 
0 
0 
Total 
500 
15 
3.00 
54 
10.8 
! ^ 
0.8 
3 0.6 
2 
0.4 
78 
15.6 
a See footnote rf, table 1. 
Chaeacter of life previous to admission. — Considering the 
patients examined with regard to the character and conditions of their 
life immediately previous to admission to the hospital, they fall into 
four main groups — those admitted from the Arm}y those admitted 
from the United States Soldiers’ Homes, those admitted from the Dis- 
trict of Columbia, and those admitted from the Nav}L A fifth or 
miscellaneous class contains a small number of United States convicts, 
patients admitted from the United States Territories, and a few men 
concerning whose previous life no data were obtainable. The Army 
group is naturall}" subdivided into three classes: First, men admitted 
before the outbreak of the Spanish-American war (1898), composed 
of soldiers from the regular army posts; second, soldiers engaged in 
that war who served within the States; and, a third and important 
class, soldiers who had returned from service in the Philippine Islands.® 
Boldiers admitted Ijefore 1898. — This class included 30 men, 1 of 
whom, or 10 per cent, had intestinal parasites. Three infections were 
with Trichuris trichiura and 1 with Oxyuris vermicularis. 
Soldiers admitted after 1898. — This class also contained 10 men, 9 
of whom, or 22.5 per cent, were infected with parasites. Eight infec- 
tions were with Trichuris trichiura and 1 with hookworms. 
Soldiers returned from the Philippines. — FifU-nine men were exam- 
ined who had returned from service in the Philippines. Twenty-five 
of these, or 12.16 per cent, had intestinal parasites. Fifteen men were 
infected with Trichuris alone, 1 with hookworms alone, T with hook- 
worms and Trichuris.^ 1 with hookworms and Strong yloides., and 1 
with hookworms, Trichuris. and Ascaris. Thus in the 59 soldiers 
« Of the soldiers admitted to the Government hospital after service in Cuba and 
Porto Rico nearly all had been discharged before these investigations were begun, 
so that the interesting statistics which might be expected from this class were not 
obtainable. 
