CHAPTER XIII 



The Coccidia 



Classification. General Considerations. Life His- 

 tory. Habitat and Effects. Isospora belli. Isospora 

 hominis. Ewieria gubleri. 



class: sporozoa. 

 order: coccidiida. 

 genus: isospora. 



species: 7. belli. 

 genus: eimeria. 



species: E. gubleri. 



THE COCCIDIA (COCCIDIIDA) 



The coccidia are very close akin in the protozoal 

 world to the parasites of malaria and have a some- 

 what similar life history, although it is carried out 

 wdthin one host instead of requiring two for its 

 completion, as in the case of the malarial parasite. 

 They are, consequently, obligatory parasites, spend- 

 ing a certain part of their life cycle wuthin certain 

 cells of their host's body, and are, therefore, always 

 and essentially pathogenic organisms. 



While the class is widespread in the animal king- 



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