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Clonorchis sinensis

Clonorchis sinensis

Clonorchis sinensis


  • Kingdom Animalia
  • Phylum Platyhelminthes
  • Class Trematoda
  • Subclass Digenea
  • Order Opisthorchiida
  • Family Opisthorchiidae
  • Genus Clonorchis

Final host

  • Piscivorous mammals (humans)


  • Adult: wide posteriorlyand tapering anteriorly
  • transparent-pinkish
  • maximum size of ≈ 25 mm long by 5 mm wide
  • The oral and ventral sucker are away from each other
  • The intestinal ceca are simple
  • The vitelline glands lie in the middle third of the side margins of the body
  • The testes are multi-branched and lie posteriorly in the body
  • The eggs are small (≈ 27-35 x 12-20 µm) and have a thick yellowish-brown wall with a conspicuous operculum
  • Eggs contain a miracidium when passed in the faeces


  • Indirect with two intermediate hosts (IH)
  • 1st IH: fresh water snail
  • 2nd IH: fresh water fish


  • Liver: intahepatic bile ducts


  • Bile juices


  • Egg


  • Metacercaria in fish