566 The Philippine Journal of Science 



3. In a school where two cases of clinical diphtheria developed 

 and where carriers of both nonvirulent and virulent bacilli were 

 found, the disease has not spread to the other children of the 

 school or to the other people with whom the carriers and cases 

 came in daily intimate association, which confirms the notion 

 that the disease does not become epidemic in Manila. 



4. In spite of the continuous existence of carriers of non- 

 virulent bacilli and the occasional existence of virulent ones in 

 persons living in institutions where a certain number have been 

 proved to be susceptible to the disease by Schick's test, no 

 clinical diphtheria has ever been known to develop among the 

 inmates. 



5. From the above data one must conclude that, for the control 

 of diphtheria in the Philippines, it is only necessary to examine 

 the throats of the individuals who have come in intimate contact 

 with cases, to isolate those who are carriers, and to liberate them 

 later if the animal tests show that the bacilli they harbor are 

 not virulent. 



ACKNOWLEDGMENT 



We desire to express our appreciation of the courtesies ex- 

 tended us by Dr. Antonio Manalac, of Bilibid Prison, and by 

 Dr. Severo Siasoco, of the Philippine Government Orphanage. 



