KALA-AZAR 



217 



in whose presence they multiply without hindrance. 

 Only monkeys and dogs are susceptible to the amebse 

 causing disease in man. No therapy depending on 

 antitoxins or vaccines is practicable. 



MASTIGOPHORA. 



Kala-azar. In the next group of protozoa, the flagel- 

 lata, several are pathogenic for man. Kala-azar is a 

 peculiar, slow disease, called by various names, depend- 



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^ %4. 



FIG. GO. Protozoa in a case of tropical ulcer. X 1500 approxi- 

 mately. (After Wright.) 



ing upon its locality dumdum fever, kala-azar, etc. 

 exhibiting a large spleen, hemorrhages, anemia, and 

 fever. The causative microorganism may be found 



