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Questions and Answers
What are the intermediate hosts for Hymenolepis nana?
What are the intermediate hosts for Hymenolepis nana?
Beetles and fleas.
How long can H. nana eggs survive in the external environment?
How long can H. nana eggs survive in the external environment?
No more than 10 days.
How long is the life span of adult H. nana worms?
How long is the life span of adult H. nana worms?
4 to 6 weeks, but internal autoinfection allows the infection to persist for years.
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Study Notes
- Hymenolepis nana eggs are immediately infective when passed with stool.
- Eggs can't survive more than 10 days in the external environment.
- Beetles and fleas can serve as intermediate hosts for H. nana.
- Oncospheres contained in the eggs are released upon ingestion.
- Oncospheres penetrate the intestinal villus and develop into cysticercoid larvae.
- Cysticercoids return to the intestinal lumen, evaginate their scoleces, and attach to the intestinal mucosa.
- Adult worms reside in the ileal portion of the small intestine and produce gravid proglottids.
- Eggs are passed in the stool through the genital atrium of proglottids or when proglottids disintegrate.
- Internal autoinfection is an alternate mode of infection.
- The life span of adult worms is 4 to 6 weeks, but internal autoinfection allows the infection to persist for years.
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