16 
TYPHOID PEVER IX DISTRICT OF COLE^MBIA. 
SANITARY CONDITIONS OF RESIDENCES. 
The disease certainly did not prevail to any unusual extent among 
persons living under poor sanitary conditions. On the contrary, it 
was more prevalent among persons living in residences of the better 
class. Most of the cases occurred in houses connected with the city 
sewerage system and in which there were water-closets. Only 72 of 
the cases occurred in houses vdth privies. 
While no special grouping of cases occurred in the neighborhoods 
where privies are numerous, we commend the efforts of the health 
officer in abolishing the privies in the District as fast as means allow. 
SCREENS AND FLIES. 
Two hundred and sixty cases occurred among persons living in 
houses that were well screened, 390 in houses that were not screened, 
94 in houses that were screened in part, and 3 in houses where the 
screens were not noted. 
The gelation to flies is as follows: Eleven cases in houses vdth prac- 
tically no flies; 287 cases in houses with few flies; 367 cases in houses 
with a moderate number of flies ; 40 cases in houses v4th many flies ; 39 
cases in houses Jh verv manv flies ; 3 cases in houses where the num- 
ber of flies was not noted. 
These figures indicate that the disease did not prevail to any special 
extent among persons Ihfing in houses where flies were abundant. 
This, however, does not take into consideration the part which may 
have been played by flies in the spread of the infection through the 
contamination of food and b}^ other means, outside of residences 
where cases occurred. 
OTHER VERMIN. 
Our studies indicate no special relation between the number of 
mosquitoes, ants, roaches, bedbugs, rats, or mice at residences and the 
prevalence of the disease. 
DOMESTIC ANIMALS. 
It is well knovm that certain infections are communicated from 
domestic animals to man. Such a relation has never been seriously 
considered for typhoid feyer. Howeyer, we giye the f ollovdng facts : 
Cases occurring in houses where there 
were — 
Dogs 197 
Cats 266 
Guinea pigs 8 
Rabbits 7 
Pet mice 1 
Horses 36 
Cows 7 
Hogs o 
Cases occurring in houses where there 
were — 
Goats 2 
Chickens 133 
Ducks 3 
Turkeys 1 
Canary birds 32 
Mocking birds 1 
Parrots 1 
