35 
The following table shows the districts in which the prevalence of 
the disease was low — less than 10 cases per 10,000: 
Data regarding vital statistical districts having a low j^revalence of typhoid fever — 10 or 
less cases per 10,000 population. 
Judging only by the data in these tables it appears that the factors 
which seemed to contribute to the liigh prevalence of typhoid fever 
were poor sanitary conditions, location in old low-lying sections of 
the city, direct contact infection, and milk infection; while the effect 
of large proportions of negroes in the population, location in rela- 
tively rural or urban sections, and of being supplied ^vith the city 
water and sewerage systems (see maps Xos. 9 and 10) seemed to be 
slight. 
These statements must not be taken as conclusions, but simply the 
evidence presented by the Hmited data in the tables. 
The Government Hospital for the Insane, vdth a population of 
about 3,000, but vdth artesian-well water, pasteurized milk, and 
generally good sanitary conditions, again this year was notably free 
from infection, only one case having occurred there. 
This case was the first to occur among the inmates of the institu- 
tion since the fiscal year ending June 30, 1903. The onset of the 
case was on July 10, and the diagnosis was confirmed by blood 
culture at the Hygienic Laboratory. The man had been in close 
