Clonorchis sinensis – hermaphrodite. Eggs will be passed in the feces of an infected human, and will hatch into a miracidium larva, this larva is eaten by a freshwater snail and wi... Clonorchis sinensis – hermaphrodite. Eggs will be passed in the feces of an infected human, and will hatch into a miracidium larva, this larva is eaten by a freshwater snail and within the snail will progress through several larval states. Then the miracidium will become a sporocyst, then a redia, and finally a cercaria larva. As the snail experiences many larval states of the parasites, it is the intermediate host. The cercaria will escape the snail tissue and burrow into the muscle tissues of the fish where it will encyst. If a human or other mammal eats this infected fish raw, the encysted larvae will pass to the stomach, where the stomach acid will help digest the cyst surrounding the larva so that when it reaches the intestines, the larva can penetrate the intestinal mucosa to enter the bile ducts. They will each reach adulthood and lay eggs. Symptoms are fatigue, abdominal discomfort, nausea, and diarrhea.
Understand the Problem
The question provides detailed information about the life cycle of Clonorchis sinensis, including its stages, hosts, and symptoms of infection. It outlines how the parasite transitions from one host to another and the impact on humans.
Answer
Clonorchis sinensis is a hermaphroditic liver fluke that infects humans through eating raw fish. It uses snails and fish as intermediate hosts.
Clonorchis sinensis is a hermaphroditic liver fluke whose lifecycle involves humans as definitive hosts and snails and fish as intermediate hosts. Eggs are passed via feces, hatch into miracidia, and infect snails and fish before infecting humans through consumption of undercooked fish.
Answer for screen readers
Clonorchis sinensis is a hermaphroditic liver fluke whose lifecycle involves humans as definitive hosts and snails and fish as intermediate hosts. Eggs are passed via feces, hatch into miracidia, and infect snails and fish before infecting humans through consumption of undercooked fish.
More Information
Clonorchis sinensis, or the Chinese liver fluke, is encountered in areas with traditional habits of eating raw fish. The infection can lead to complications like bile duct obstructions and even cholangiocarcinoma if untreated.
Tips
A common mistake is not thoroughly cooking fish, which allows the encysted larvae to survive and cause infection.
Sources
- Clonorchis Sinensis - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Clonorchiasis - CDC - cdc.gov
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