101 
Of 1,101 households canvassed, only 614, or about 54 per cent, habit- 
ually used raw milk. Of the remainder, 11 per cent used home- 
heated milk, 7 per cent commercially pasteurized milk, 11 per cent 
condensed milk, 2 per cent used milk very rarely, and 10 per cent 
used no milk. 
There are now in IVashington three dairymen (Xos. 3, 4, and 10, 
see chart Xo. 9), each doing a large business, who have installed pas- 
teurizing machines and who claim that all the milk which they supply 
their customers is pasteurized. In our figures, however, we confine 
the number of cases as having used pasteurized milk to those who 
had pasteurized the milk after receiving it from the dairy. 
Dairymen Xos. 3 and 4 began pasteurizing their supplies of milk 
about July 1, 1908. The number of cases of typhoid fever among 
their customers- per 100,000 gallons of milk sold during the t^’phoid 
seasons of the two years before pasteurization and the year of pas- 
teurization (1908) was as follows: 
Dairyman Dairyman 
No. 3. No. 4. 
16. 6 52. 5 
7. 1 21. 6 
5.8 10.1 
The reduction in the number of cases since pasteurization is marked, 
especially for dairyman Xo. 4. This dealer had a pronounced out- 
break among his customers from October 2 to October 21, 1906. 
The outbreak was attributed to mfection iatroduced into the milk 
from a typhoid-fever patient on one of the farms at that time sup- 
plying this dealer with milk. If pasteurization of the milk at his 
dairy had been done at that tune, the outbreak would not have 
occurred and Washmgton would have been saved 32 of the cases of 
typhoid fever which developed m October, 1906. 
The followmg table gives the number of cases of typhoid fever per 
100,000 gallons of milk sold by the prmcipal dealers durmg the three 
1906, no pasteurization 
1907, no pasteurization 
190S, pasteurization . . . 
vears. 
