Clinical Laboratory Science Parasitology Practice Test 2026 – Complete Exam Prep

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Praziquantel is effective against which group of parasites?

Nematodes

Cestodes

Praziquantel works by disrupting the parasite’s tegument and increasing calcium permeability, which causes strong, sustained contractions and paralysis, leading to death. This mechanism targets flatworms most effectively—tapeworms (cestodes) and flukes (trematodes)—making cestodes the correct group among the choices. It isn’t reliably effective against nematodes (roundworms), protozoa, or microsporidia, which require different drugs with different targets and mechanisms.

Protozoa

Microsporidia

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