150 
bacilli, may be stored in the body but their growth inhibited in some 
way until the specific resistance of the persons becomes lowered, 
and allows the organisms to multiply and produce the disease. 
That prolonged periods of storing (incubation) of the organisms 
are the rule is not borne out by the numerous observations that pro- 
nounced outbreaks of typhoid fever in a given community cease quite 
abruptly within about a month after the known source of infection 
causing the outbreak is removed. The possibility of exceptional 
and inchvidual cases beiug accounted for by such long periods of 
storage of the infecting organisms, however, must be recognized. 
This is a possible explanation of the case occurring ad the Government 
Hospital for the Insane. (See p. 35.) 
NEWCOMERS. 
Data relative to the newcomers in the residences at which cases 
occured are given in the follo^ving table. By newcomers” is meant 
persons who moved into the house within three months before the 
onset of the case. 
X umber of cases at private residences at wMcb there were one or more newcomers . 33 
At hotels, rooming houses, hospitals, and other public institutions 34 
Xot determined 1 
Xo newcomers 474 
Total 542 
Of the 33 cases occurring at private residences at which there were 
newcomers, there were 12 cases associated with newcomers who were 
said never to have had typhoid fever, 6 with newcomers whose 
typhoid history could not be learned, 1 vdth a newcomer who had 
had typhoid fever within one year, 1 with a newcomer who had had 
typhoid between 4 and 5 years previous, 8 tvith newcomers who had 
had typhoid from 6 to 10 years previous, 3 with newcomers who had 
had typhoid from 13 to 20 years previous, and 2 with newcomers who 
had had typhoid from 40 to 45 years previous. 
Specimens of feces and urine from 10 newcomers suspected to be 
possible bacillus carriers were examined bacteriologically, but all 
were negative for the typhoid bacillus. 
SERVANTS. 
Seventy-two, or about 13 per cent, of ^the 542 cases occurred at 
homes at which servants were employed. Of the 523 cases investi- 
gated in 1907, 71, or about 13 per cent, and of the 306 cases investi- 
gated in regard to servants in 1906, 69, or about 22 per cent, occurred 
at homes at which seiwants were employed. 
The decided decrease for the last two years in the proportion of 
cases among persons of the servant -employing or wealthier class is 
interesting. Of the 72 cases occurring in 1908 at homes at which 
