126 INFECTIOUS AND PARASITIC DISEASES. 



may invade the vagina. They have been found in the 

 appendix. 



Treatment is with santonin as in infestment with 

 Ascaris Lumbricoides, and the daily irrigation of the 

 colon with strong salt water. These measures, how- 

 ever, do not always effect expulsion, and the worms may 

 be parasitic for years despite every effort to dislodge 

 them. Self-pollution may be responsible in some cases, 

 at least, for the obstinacy with which they resist removal. 



The Uncinaria duodenalis (strongylus 

 Uncinaria duodenalis, anchylostoma duodenalis, hook- 

 DuoDENALis. worm), is a parasitic worm which has its 



habitat in the duodenum, the jejunum, 

 and occasionally the colon. The condition to which 



Fig. 12. — Tail, with expanded 

 Fig. 1 1 . — ^Tail, with expanded bursa, bursa, of male uncinaria A mericana. 

 of male uncinaria duodenalis. (Tyson.) (Tyson.) 



it gives rise is known under as many names as the 

 parasite, viz., anchylostomiasis, uncinariasis, hook- 

 worm disease, Egyptian chlorosis, etc. 



