Hymenolepiosis is also a disease of populations living under conditions of poor hygiene and poverty. It is prevalent in school children in tropical and subtropical climates. The disease is acquired by ingestion of water and food contaminated with mouse feces, and can also be transmitted from one child to another by passing infective eggs on dirty hands.
H. nana infections induce humoral and cellular immunity, which probably accounts for the
Adult in S small intestine H,
ScoFex attaches to intestine
Cysticercoid emerges from villi
Gravid proglottid disintegrate
ünoosphere is released and develops ta a cystioercciid between intestinal vill
Embryonated egg in fews I
Emhryonated &gg (infectious form)
Fig. 23.16 Life-cycle of Hymenolepis nana lower prevalence of this parasitosis observed in adults living in endemic communities. Experimental evidence has demonstrated that IgE and mast cells are involved in the expulsion of adult worms from the intestine (Watanabe et al., 1994).
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