HOST-PARASITE RELATIONS I INTESTINAL PROTOZOA 



Stripper and frequently got fecal material in his mouth; 

 DeBuys (1918) reports a case in a colored boy of 5 who 

 ''had been accustomed to help 'round up' the pigs in the 

 pen every day and frequently would eat some food which 

 he would hold in his hand while helping with the pigs. 

 It was his habit also to go into the pen at times when 

 he ate his food"; Cordes (1921) describes a case in a 

 pork butcher who had been slaughtering pigs for thirty 

 years; Graziader and Mario (1922) treated a case in a 

 peasant who was accustomed to eat raw salad grown on 

 soil fertilized with pig manure ; and Jausion and Dekester 

 (1923a) report two cases from Morocco in villagers who 

 were closely associated with pigs. Direct infection of man 

 with cysts of B. coli from the pig has been attempted 

 (Grassi, 1888) but with negative results. 



There is good evidence obtained from cross-infection 

 experiments that the ciliate of the pig and that of certain 

 apes belong to one species. Brumpt (1909) established 

 infections in two young pigs by injecting material con- 

 taining balantidia from monkeys of the species Macacus 

 cynomolgus (see below) and succeeded in infecting a 

 monkey of this species with rectal injections of balan- 

 tidial material from pigs. Twelve days after the injec- 

 tions a few balantidia were found and 4 days later an 

 enormous number were present, leaving no doubt that 

 colonization had taken place in the monkey. 



Primates. Balantidia were first reported from pri- 

 mates, other than man, by Brooks (1903) who found 

 them in orang-utans in the New York Zoological Gar- 

 den; they were the cause of fatal dysentery in these 

 animals. In igo8, Noc recorded B. coli in a monkey, 



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