SPECIAL BACTERIOLOGY 
155 
Corps, was sent to England to study the question. Upon 
his return the typhoid vaccine was adopted for the 
United States Army and Navy, and, subsequently, 
throughout the entire civilized w r orld. 
All persons should be vaccinated with typhoid vaccine 
as it confers almost absolute immunity for at least three 
years. 
As it is now put up at the United States Army Med¬ 
ical School, it is a “triple” vaccine, containing the 
typhoid, the paratyphoid A and paratyphoid B bacilli, 
1.000 million of each to each c.c. 
The preparation of the vaccine is practically the same 
as that described for staphylococcus vaccine. 
IX. Summary of Important Characteristics 
The important characteristics are the same as those 
of colon, except that it produces acid only (as gas) on 
all common sugars except lactose and saccharose. Causes 
typhoid fever, is essentially a “water-borne” disease; the 
preventive vaccination is of tremendous importance. 
The disease is of such practical importance to the 
nurse that no attempt is made to summarize this chap¬ 
ter, and the reader is advised to read carefully the en¬ 
tire chapter. 
