Which parasite group is also called blood worms?

• A. Strongyles
• B. Nematodes
• C. Tapeworms
• D. Flukes

Answer: (A)

The idea here is that some parasite names come from how they act in the host. “Blood worms” describes nematodes whose larvae migrate through the host’s bloodstream, causing vascular damage. In horses, large strongyles (Strongylus spp.) are well known for migrating in the arteries, which is why they’re commonly called blood worms. So the best match is the strongyles group, a subset of nematodes. Tapeworms and flukes are flatworms, and the broad category of nematodes includes many parasites but isn’t the name people use for this blood-related behavior.