“370 PROTECTIVE INOCULATIONS. 
the end of twenty days his blood serum exhibited an agglutinating 
power forty times greater than that of normal blood. In practice it 
has been found advisable to repeat the inoculation at the end of a 
week. Wright reports that among 11,295 British soldiers inoculated 
in India, the percentage of those who subsequently contracted ty phoid 
fever was 0.95, while 2.5 per cent of those not inoculated suffered an 
attack of this disease. According to Foulerton the soldiers in South 
Africa, during the Boer war, who have been inoculated have contracted 
typhoid fever in the proportion of six per thousand, while those not 
inoculated have suffered to the extent of nine per thousand. How 
much value should be attached to these statistics it is difficult to say, 
on account of the numerous factors which are likely to influence the 
result. Thus a command on the march in a sparsely inhabited coun- 
try would be much less liable to suffer from typhoid fever than another 
located in a town and remaining for a considerable time on the same 
camping ground. In a recent report (February, 1901) Professor 
Wright states that of 539 officers, men, and women connected with the 
Fifteenth Hussars at Meerut, India, 360 received protective inocula- 
tion in England against typhoid fever and 179 did not. Of the former 
2 (0.55 per cent) were admitted to the hospital, suffering from ty phoid 
fever, with 1 death (0.27 per cent); while of the latter 11 (6.14 per cent 
were attacked by the fever, with 6 deaths (8.35 per cent). 
It is evident that, while the results reported are encouraging, this 
method should not be relied upon as a substitute for those sanitary 
measures which must be our main reliance for the prevention of epi- 
demics of this disease, viz., sterilization of drinking-water, disinfec- 
tion of excreta, sanitary police of camps, etc. 
