6o2 TROPICAL HYGIEXE, SANITATION. ETC. 



Bacterial dysentery vaccines for chronic cases are most useful where 

 there are epidemics of chronic dysenter}^. The sera are more useful in 

 the acute stage. 



Combined vaccines are used and recommended by Castellani. 

 One vaccine made and used by him was for Cholera, Plague, Typhoid. 

 Paratyphoid A and B and I'ndulant Fever together. The inoculation 

 was harmless. Time and experiments alone will indicate their thera- 

 peutic and prophylactic value. 



