The first intermediate host for all the trematodes is which of the following?

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

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
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