CHAPTER IV 



RECENT CONSIDERATIONS CONCERNING THE 

 INTESTINAL PROTOZOA OF MONKEYS 



By 



John F. Kessel 

 School of Medicine, University of Southern CaUfornia 



INTRODUCTION 



The intestinal protozoa of monkeys have attracted attention 

 primarily from two main angles of interest, the first being from a 

 medical point of view. 



Monkeys have been shown to harbor protozoa similar in mor- 

 phology to those found in man and also to exhibit symptoms 

 similar to intestinal protozoiasis of man. Macfie (1913), Eichhorn 

 and Gallagher (1916), Fox (1923) and others have reported out- 

 breaks of acute amoebiasis in monkeys; Kessel (1928) figures the 

 invasion of amoebae into the lymphatic nodules of the intestine 

 in a monkey which showed no acute symptoms, thus illustrating 

 chronic intestinal amoebiasis; and Castellani (1908) and Kartulis 

 (1913) report amoebic fiver abscess. These observations together 

 with the findings of Kessel (1924a and 19280?) and Dobell (1926 

 and 1928) in which Macaciis monkeys have been infected with E. 

 histolytica and certain other intestinal protozoa of man indicate 

 that monkeys may be used to advantage in the study of human 

 intestinal protozoiasis. 



The second interest has been purely theoretical and relates to 

 the evolutionary significance of the above findings. This has been 

 specially emphasized and popularized by Hegner (1928^ and 

 1929). 



evidences of species relationship 



When first observed, the intestinal protozoa of monkeys were 

 given many new species names and in some instances attempts 



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