68 PROTOZOAN PARASITISM 



sue of the intestinal wall in experimental infection 

 of the rabbit. 



Their invasion of the blood vessels of the involved 

 intestine explains the most common extension which 

 occurs, that to the liver. Here some think they pro- 

 duce a not uncommon hepatitis. The well-known 

 amoebic lesion in this organ is the abscess, single or 



Fig. 10. — Amoebic Abscess of Liver. 

 (U. S. Army Medical Museum Specimen.) 



multiple. The characteristic pathology of amoebia- 

 sis is in evidence in the abscess of the liver. The cen- 

 ter of the focus of implantation undergoes necrosis 

 and destruction, there is a mild type of reaction, in- 

 volving hyperemia, plasma exudation, fibrin deposit, 

 some mononuclear infiltration, with a few polymor- 

 phonuclear leucocytes, there being no gross or micro- 

 scopic pus as seen is abscesses of bacterial production, 



