CHAPTER XLIV 



PATHOGENIC PROTOZOA OF THE INFUSORIA 



THE Infusoria are differentiated from other protozoa by the 

 presence of cilia at some stage in the life-history, by the presence 

 usually of mouth parts for swallowing or sucking, and by the pres- 

 ence of two kinds of nuclei, micronuclei and macronuclei. Repro- 

 duction is usually accomplished by simple fission or by budding. 

 Only a single genus and a single species is known to be pathogenic. 



Balantidiwm colt 



Disease Produced. A rare fatal enteritis in man. 



Fig. 211. Balantidium coli in a blood-vessel of the submuoosa of the intes- 

 tines (Bowman, in " Philippine Journal of Science"). 



This organism is oval in shape 50 to 70 by 60 to 100 (* and 

 a funnel-shaped peristome which terminates at the; mouth. 



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