What is the intermediate host for Schistosoma species?

What is the intermediate host for Schistosoma species?

• A. Snails
• B. Mosquitoes
• C. Pigs
• D. Fish

Answer: (A)

Schistosoma species rely on a freshwater snail as the essential intermediate host. Eggs released by humans hatch into miracidia, which infect specific snails. Inside the snail, the parasite develops through stages and releases cercariae back into the water. Those cercariae then penetrate human skin to continue their life cycle, maturing into adults in the venous systems. The snail’s role is necessary for the parasite to develop before it can infect humans, making snails the intermediate host. Other listed organisms are not part of Schistosoma’s development: mosquitoes handle other parasites, pigs can be a reservoir for some Schistosoma species but are not the snail host, and fish are not involved in this parasite’s life cycle.

Schistosoma species rely on a freshwater snail as the essential intermediate host. Eggs released by humans hatch into miracidia, which infect specific snails. Inside the snail, the parasite develops through stages and releases cercariae back into the water. Those cercariae then penetrate human skin to continue their life cycle, maturing into adults in the venous systems. The snail’s role is necessary for the parasite to develop before it can infect humans, making snails the intermediate host. Other listed organisms are not part of Schistosoma’s development: mosquitoes handle other parasites, pigs can be a reservoir for some Schistosoma species but are not the snail host, and fish are not involved in this parasite’s life cycle.