The dwarf tapeworm, a parasite in the intestine of rats and mice; also commonly found in humans. It averages about 1 in (2.51 cm) in length and differs from other tapeworms in that it is capable of completing its life cycle within a single host. The parasite, which in humans lives in the proximal ileum, can cause severe toxic symptoms, esp. in children. Included are diarrhea, abdominal pain, irritability, and convulsions that resemble epilepsy. The detection of eggs and gravid segments in the feces confirms the diagnosis of infestation with this parasite. Treatment is with praziquantel.

Figure: HYMENOLEPIS NANA
(A) Scolex, (B) mature proglottids (orig. mag. ×100)

Main entry:
Hymenolepis