Question: The first intermediate host for all the trematodes is which of the following?
A Fish
B Snail
C Shrimp
D Water plant
Answer: Snail
| Class Trematoda | Description |
| Common Name | · Trematodes · Flukes |
| Habitat | Found in the digestive, respiratory or circulatory systems of vertebrate hosts and often in mollusks as intermediate hosts. |
| Body Shape | · Flat, leaf-shaped · Non-segmented body |
| Life Cycle | · Eggs · Miracidia · Sporocysts · Rediae · Cercariae · Metacercariae |
| Infestation | Infection occurs through ingestion or penetration by cercariae. |
| Intermediate Hosts | The first intermediate host is often a mollusk (e.g., snail) |
| Host Range | · Humans · Domestic animals · Wildlife |
| Pathogenicity | Some trematodes can cause diseases in humans and animals, leading to symptoms like organ damage, anemia and inflammation. |
| Examples | · Schistosoma spp · Fasciola hepatica · Clonorchis sinensis |
| Prevention | Sanitation and snail control |
| Treatment | Chemotherapy with antiparasitic drugs |