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Clonorchis sinensis Life Cycle and Symptoms

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Clonorchis sinensis Life Cycle and Symptoms

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Questions and Answers

What is the role of the freshwater snail in the lifecycle of Clonorchis sinensis?

It serves as the primary host for the adult parasite.

It is responsible for laying the eggs of the parasite.

It is the intermediate host where the parasite undergoes several larval stages. (correct)

It allows for the encystment of the cercaria larva.

What happens to the cercaria larva after it escapes the snail tissue?

It burrows into the muscle tissues of fish and encysts. (correct)

It travels to the human intestine directly.

It immediately develops into an adult in the snail.

It lays eggs in the snail.

Which symptom is NOT associated with infection from Clonorchis sinensis?

Severe fever (correct)

Fatigue

Nausea

Abdominal discomfort

How does a human become infected with Clonorchis sinensis?

<p>By eating raw fish infected with the encysted larva.</p> Signup and view all the answers

What facilitates the digestion of the cyst surrounding the larva when ingested by a human?

<p>Stomach acid</p> Signup and view all the answers

Study Notes

Clonorchis sinensis Life Cycle

C. sinensis is a hermaphroditic trematode (fluke).
Eggs are passed in human feces.
Eggs hatch into miracidia, which infect freshwater snails (intermediate host).
In the snail, miracidia develop into sporocysts, then rediae, and finally cercariae.
Cercariae leave the snail and encyst in fish muscle (transport host).
Humans become infected by eating raw or undercooked infected fish.
In the human intestine, the larvae penetrate the intestinal mucosa and migrate to the bile ducts.
Adults mature in the bile ducts and produce eggs, completing the cycle.

C. sinensis Symptoms

Fatigue
Abdominal discomfort
Nausea
Diarrhea

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Description

Explore the fascinating life cycle of Clonorchis sinensis, a hermaphroditic fluke. This quiz covers the stages from egg release to adult maturation in humans, along with common symptoms associated with infection. Test your knowledge of this significant parasitic organism.