OF THE ALIMENTARY TRACT 205 



sterile. The epithelium in early infection was intact 

 except for mechanical injury, attributed to the en- 

 trance of balantidia or to minute hemorrhages, there 

 being no exudation or ulceration. 



Strong found the organisms invading the mucosa, 



Fig. 32. — Balantidial Colitis. 



Group of Balanlidium coli in the tissues of the submucosa below 

 ulcer of the mucosa of the colon. Photomicrograph x 43. 



submucosa and muscular layers. They were less 

 numerous in the necrotic areas and were found in 

 the margins of healthy tissue around these areas. 

 The capillaries of the mucosa and submucosa were di- 

 lated, contained balantidia, and often showed hem- 

 orrhage. The amount of infiltration was small about 



