74 SWINE DISEASES 



The Cysticercus tenuicollis is occasionally observed 

 involving the peritoneum of swine, although in the 

 central United States these cysts are much more common 

 in sheep. These cysts contain only one tapeworm 

 embryo, differing in this particular from the cysts of 

 the Tsenia echinococcus. They have a double membrane, 

 the embryo is suspended in a thin, watery fluid that fills 

 the cyst, which may attain the size of an English walnut. 



Stephanurus dentatum, both in the adult and larval 

 stage, may be found in relation to the peritoneum. The 

 lesions they produce in the peritoneum are the same as 

 those produced by this parasite elsewhere in the body. 



The Ascaris suum may bore through the intestine and be 

 found in the peritoneal cavity. As they pass out of the 

 intestine they carry various bacteria with them and pos- 

 sibly also permit the escape of some intestinal content 

 which is always teeming with bacteria. Thus infectious, 

 usually septic, peritonitis results. 



