SCHISTOSOMIASIS 



251 



(2) IXFECTION WITH S. JAPONICUM. 



DISTRIBUTION. 



This is known in Japan as Katayama disease from a Japanese town 

 in which it was common. The parasite is similar to S. haematobium. 



Schistosoma japonicutn : 

 from dog. Uterine egg. X c. 

 800. (After Katsurada.) 



Schistosoma japonic urn : from dog. 

 X c. 800. (After Katsurada). 



Schistosoma japonicum : from dog. 

 Egg from faeces. X c. 800. (After 

 Katsurada.) 



It is found in Japan, China, and in the Philippines. 



In China the cases are only found in the low-lying districts. 



THE PARASITE. 



The S. japonicum is introduced by the skin or mouth from polluted 



water. 



