Cysticercoid Larvae and Hymenolepiasis Quiz

Humans or rodents

Arthropods

By eating contaminated food such as cereals, grains, and grain-based foods.

<p>They release onchospheres and develop into cysticercoid larvae.</p> Signup and view all the answers

<p>Eggs release their onchospheres that penetrate the intestinal villi and continue the life cycle without exiting the body.</p> Signup and view all the answers

<p>Gravid proglottids and eggs</p> Signup and view all the answers

<p>Round or slightly oval with a striated thick outer membrane and a thin inner membrane. Oncospheres have six hooks.</p> Signup and view all the answers

<p>H. diminuta oncospheres have six hooks and a smooth or slightly granular space between the two membranes, while H. nana oncospheres have six hooks and polar filaments filling the space between the oncosphere and outer shell.</p> Signup and view all the answers

<p>Both eggs can be detected in stool specimens.</p> Signup and view all the answers

<p>H. nana scolex has four suckers and a rostellum with hooks, while H. diminuta scolex has four suckers but no hooks.</p> Signup and view all the answers

<p>The intermediate hosts, such as insects, ingest the eggs. Larvae develop in the intermediate host and then are ingested by rodents. Rodents are then eaten by insects, completing the life cycle.</p> Signup and view all the answers

<p>Most often asymptomatic. Heavy infections with H. nana can cause weakness, headaches, anorexia, abdominal pain, and diarrhea.</p> Signup and view all the answers

<p>Humans or other fish-eating animals</p> Signup and view all the answers

<p>Freshwater crustaceans</p> Signup and view all the answers

<p>Crustaceans (first intermediate host)</p> Signup and view all the answers

<p>Unembryonated</p> Signup and view all the answers

<p>Plerocercoid larvae</p> Signup and view all the answers

<p>Freshwater larger fish (3rd paratenic host)</p> Signup and view all the answers