17,1 Brillantes: Disease-carrier Problem 117 
2. That, in a number of cases and carriers, the preéxisting 
vibrios (either agglutinable or nonagglutinable) may change into 
the opposite and that, hence, it is unwise in any anticholera cam- 
paign to disregard the existence of nonagglutinable vibrios. 
BACILLARY DYSENTERY CARRIERS 
In connection with bacillary dysentery carriers the literature 
is very scant.. In 1914 the Bureau of Health stated that the 
Igorrots were frequently afflicted with, or had among them 
carriers of, bacillary dysentery. There is, however, nothing 
mentioned in connection with any definite examination to detect 
this condition. 
CONCLUSIONS 
1. Carriers of typhoid, cholera, and diphtheria have been 
definitely proven to occur in the Philippines, but so far the 
greatest amount of research has been done in connection with 
cholera-vibrio carriers. 
2. Carriers apparently do not play an appreciable part in the 
spread of typhoid fever, at least in Manila. — 
8. Carriers of the diphtheria and cholera bacilli, on the other 
hand, do play an important roéle in the dissemination of these 
diseases and constitute the main factors in the annual outbreaks 
that have been observed. 
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