Intestinal Fasciolopsis

• Intestinal Flukes


  • Fasciolopsis buski
  • Echinostoma ilocanum
  • Artyfechinostomum malayanum
  • Heterophyes heterophyes
  • Metagonimus yokogawai
  • Gastrodiscoides hominis
• Fasciolopsis buski


  Giant intestinal fluke, largest intestinal fluke
• Life Cycle of Fasciolopsis buski

  1. Adult stage in small intestine

  2. Eggs discharged in stool of human host

  3. Eggs hatch into miracidium that infects snail first intermediate host

  4. Miracidium becomes sporocyst, redia, and then cercaria in snail

  5. Cercaria infects aquatic plant second intermediate host

  6. Humans infected by eating raw aquatic plants or second intermediate host

  
• Humans are the definitive host for Fasciolopsis buski
• Trematodes lay embryonated ova except for P.E.F.F. (Paragonimus, Echinostoma, Fasciola, Fasciolopsis)
• What can be demonstrated in the feces of the definitive host is the unembryonated ovum
• The ovum must stay for several days in the water before a miracidium will emerge from it
• The most common definitive host of Fasciolopsis buski is the pig
• Fasciola adult


  • Branched intestine
  • Branched testes
  • Branched ovary
  • Vitellaria extending up to posterior
• Fasciolopsis adult


  • No cephalic cone and shoulder
  • Simple, unbranched intestine
  • Large ventral sucker
• Fasciolopsis buski


  Common name: Giant Intestinal Fluke, largest pathogenic intestinal fluke to humans
• Fasciolopsis egg


  Yellowish brown, ovoid, operculated, unembryonated upon passage, indistinguishable from Fasciola egg
• Fasciolopsis egg can be differentiated from Paragonimus westermani egg by the thickening on the posterior side of the P. westermani egg
• First intermediate host of Fasciolopsis


  • Segmentina or Hippeutis
• Second intermediate host of Fasciolopsis


  • Trapa bicornis (Water caltrops)
  • Eleocharis tuberosa (Water chestnuts)
  • Ipomea obscure (Obscure morning glory)
  • Nymphea lotus (Lotus)

  
• Eating raw second intermediate host or aquatic plants


  Increases risk of fasciolopsiasis (fascioliasis)