Hymenolepiasis and Lifecycle of Hymenolepis nana Larvae
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Questions and Answers

Describe the morphology of Hymenolepis nana eggs.

Oval with a thin wall, smaller than Hymenolepis diminuta eggs. Oncospheres have six hooks.

What are the symptoms of hymenolepiasis?

Most often asymptomatic, but heavy infections can cause weakness, headaches, anorexia, abdominal pain, and diarrhea.

Which hosts can harbor Hymenolepis diminuta?

Rodents are the primary hosts of H. diminuta.

How is Hymenolepis diminuta transmitted to humans?

<p>Humans can get infected by ingesting fleas contaminated with cysticercoid larvae.</p> Signup and view all the answers

Describe the life cycle of Hymenolepis diminuta.

<p>The adult tapeworm lives in the small intestine of rodents, and humans get infected by ingesting fleas containing cysticercoid larvae.</p> Signup and view all the answers

What is the morphology of H. nana eggs?

<p>Morphology of H. nana eggs is small, oval, and has a polar thickening called the operculum.</p> Signup and view all the answers

What are the symptoms of Hymenolepiasis in humans?

<p>Symptoms of Hymenolepiasis in humans include abdominal pain, diarrhea, and weight loss.</p> Signup and view all the answers

What are the hosts of H. diminuta?

<p>Definitive host of H. diminuta includes humans or rodents, and the intermediate host is arthropods.</p> Signup and view all the answers

How is H. diminuta transmitted to humans?

<p>H. diminuta is transmitted to humans by ingesting an intermediate host carrying the cysticercoid larvae.</p> Signup and view all the answers

Describe the life cycle of H. diminuta.

<p>In the life cycle of H. diminuta, eggs are passed in the stool, ingested by an arthropod intermediate host, and develop into cysticercoid larvae.</p> Signup and view all the answers

What are the hosts of Hymenolepis diminuta?

<p>1st Intermediate host: Freshwater crustaceans. 2nd intermediate host: Freshwater small fish. 3rd paratenic host: Freshwater larger fish.</p> Signup and view all the answers

How is Hymenolepis diminuta transmitted to humans?

<p>By eating raw or undercooked freshwater fish infected with the plerocercoid larvae.</p> Signup and view all the answers

Describe the morphology of Hymenolepis nana eggs.

<p>Hymenolepis nana eggs are unembryonated when passed in human feces and become embryonated later.</p> Signup and view all the answers

What are the symptoms of Hymenolepiasis?

<p>Symptoms of Hymenolepiasis include abdominal pain, diarrhea, and weight loss.</p> Signup and view all the answers

Explain the life cycle of Hymenolepis diminuta.

<p>Unembryonated eggs are passed in human feces, become embryonated later, hatch in freshwater, develop into ciliated coracidia, ingested by crustaceans, develop into procercoid larvae, then small fish ingest the infected crustacean and produce plerocercoid larvae within their tissues.</p> Signup and view all the answers

What are the characteristics of Cyclophyllidean tapeworms in terms of reproduction and egg production?

<p>Cyclophyllidean tapeworms possess a branched uterus with lateral genetical pores and produce non-operculated eggs that generate non-ciliated larvae.</p> Signup and view all the answers

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