BALANTIDIUM COLI ! PRIMATES 



Macacus cynomolgus, from the Pasteur Institute in 

 Saigon, Cochin-China and Brumpt (1909) found them 

 in six monkeys of the same species that probably came 

 from Indo-China. As noted above two pigs were success- 

 fully infected with material from these monkeys and a 

 clean monkey with material from pigs. B. coli was next 

 noted by Joyeux (191 3) in a baboon in French Guinea 

 and successfully transferred to an uninfected baboon. 



Extensive experiments with monkeys (name unde- 

 termined) were carried out by Walker (1913) in the 

 Philippine Islands. Cysts or trophozoites or both from 

 man or pig were fed to or injected per rectum into the 

 monkeys. Of 13 monkeys that were fed cysts from pigs, 

 12 became infected ; of 4 injected per rectum with tropho- 

 zoites from pigs, one became infected; of 3 injected per 

 rectum with trophozoites from man, one became in- 

 fected; one injected per rectum with both cysts and 

 trophozoites from man became infected but one fed cysts 

 from man remained uninfected. Balantidia were found 

 in the tissues of the monkey that received rectal injec- 

 tions of cysts and trophozoites from man and in one 

 monkey that was fed cysts from pigs. 



Balantidia have also been reported from the chim- 

 panzee. Christeller (1922) describes fatal balantidial 

 dysentery in two specimens in the Berlin Zoological 

 Garden. In one the ciliates were found in the tissues at 

 autopsy; in the other they occurred in the stools but 

 were not found at autopsy because of decomposition. 

 Six cases of balantidial infection in chimpanzees in the 

 Berlin Zoological Garden were later reported by Zie- 

 mann (1925). In two of these the balantidia were found 



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