SUMMARY AND RECOMMENDATIONS. 
The prevalence of typhoid fever in the District of Columbia is 
due to several causes. During the period covered by our investiga- 
tion we found that about 10 per cent of the cases were attributable 
to infected milk; about 15 per cent of the cases were imported; 
about 6 per cent of the cases were traceable to contact.’^ This 
accounts for about 30 per cent of the 866 cases studied. 
EPIDEMIOLOGICAL STUDIES. 
Eight hundred and sixty-six cases of typhoid fever reported 
between June 1 and November 1 , 1906^ were investigated. 
SEX. 
The number of cases was relatively somewhat higher in males 
than in female*. 
RACE. 
The morbidity rate was a trifle higher and the mortality rate was 
much higher in the colored than in the white race. 
The following is a statement of the typhoid death rates per 100,000 
according to race for the last twelve years: 
Year. 
1895 
1896, 
1897 
1898 
1899 
1900 
1901 
1902 
1903 
1904 
1905 
1906 
Average 
Total. 
White. 
Colored. 
73.8 
64.3 
94.1 
51.0 
46.8 
60. 4 
43.6 
37.5 
56.6 
64.3 
50.2 
95.3 
67.2 
47.3 
111.0 
74. 1 
64.0 
96.7 
56.4 
42.8 
87. 1 
74.0 
71.5 
79.7 
45.0 
38. 1 
60.8 
43.8 
35.5 
63.4 
43.9 
40.0 
53.3 
49.3 
35.4 
83. 1 
57.2 
47.78 
78.45 
AGE. 
The bulk of the cases occurred between the ages of 10 and 30 
years. A conspicuously large number of cases occurred in children 
under the age of 15 years. The prevalence of the disease among 
