Epidemiology

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

├╝noosphere is released and develops ta a cystioercciid between intestinal vill

Human

Ingested

Embryonated egg in fews I

Emhryonated &gg (infectious form)

(Diagnosis stage)

Environment

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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