103 
The following table gives the cases date of onset of definite 
symptoms : 
Number of cases. 
Date of onset. 
' 
Among 
customers 
of dealer 
No. 59. 
Among 
customers 
of dealer 
No. 11. 
Total. 
Sept. 24 
2 
1 : 
3 
29 
1 
0 ' 
1 , 
! 30 
2 
2 
4 
Oct. 1 
1 
2 
3 
9 
1 
1 
2 
3 
2 
1 
3 
4 
0 
1 
1 
5 
1 
1 
' 2 
6 . 
2 
1 
3 
2 
3 
5 
8 
3 
0 
3 , 
9 
3 
3 
6 
10 
2 
1 
3 1 
11 
1 
0 
1 
12 
1 
0 
1 
13 
1 
0 
1 
14 
2 
1 
3 
] 15 
2 
0 
2 
i 16 
0 
1 
1 
1- 
1 
0 
1 
18 
2 
0 
2 
19 ... 
0 
0 
0 
20 
0 
0 
0 , 
21 
0 
0 
0 1 
99 
1 
1 
2 
23 
0 
0 
0 
24 
0 
1 
1 
Total 
33 
21 
54 
The records of the health department showed that during the 
entire twelve months preceding this outbreak no cases had occurred 
in households supplied by dairyman No. 59 and only 7 in households 
supplied by dairyman No. 11. It was evident, therefore, that there 
had occurred among persons supplied with milk by these two dealers 
an unusually large number of cases. 
At the time of the beginning of this outbreak the prevalence of 
typhoid fever generally in the District of Columbia was on the 
decline. (See Chart Xo. 1.) 
The sudden and marked increase in cases was confined to sections 
of the city supplied with milk by these two dealers and in those sec- 
tions the unusual number of cases were confined to persons using 
milk from these two dealers. Most of the cases were in the western 
section of the city commonly known as Georgetown. Here cer- 
