🦠microbiology review

Opisthorchis felineus

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025

Definition

Opisthorchis felineus is a parasitic flatworm, belonging to the class Trematoda, that infects the liver, gallbladder, and bile ducts of mammals including humans. It primarily causes opisthorchiasis, a significant helminthic infection in various parts of the world.

5 Must Know Facts For Your Next Test

  1. Opisthorchis felineus is transmitted through consumption of raw or undercooked freshwater fish containing infectious larvae.
  2. The adult worms reside in the bile ducts and can cause inflammation, fibrosis, and even bile duct cancer if left untreated.
  3. Diagnosis typically involves microscopic examination of stool samples to identify characteristic eggs of Opisthorchis felineus.
  4. Praziquantel is the treatment of choice for infections with Opisthorchis felineus.
  5. Preventive measures include proper cooking of freshwater fish and improved sanitation practices.
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