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Overview
 
 
 
Introduction
  • Classification
    • helminths include
      • roundworm
      • flukes
      • tapeworms (cestodes - this topic)
        • tapeworms include
          • Taenia solium
          • Taenia saginata
          • Diphyllobothrium latum
          • Echinococcus granulosus/multilocularis 
Taenia solium
  • Introduction
    • also known as pork tapeworm
  • Diseases
    • intestinal tapeworm
      • ingestion of encysted larvae (cysticerci) in undercooked pork
    • cysticercosis
      • ingestion of eggs
      • eggs hatch and larvae migrate throughout the body
      • larvae penetrate tissue and encyst there, forming cysticerci
    • neurocysticercosis
      • as above, except larve encyst in the brain causing "swiss cheese" lesions
      • neurocysticercosis is a common cause of adult-onset seizures
  • Treatment
    • praziquantel
    • use -bendazoles for neurocysticercosis

 

Taenia saginata
  • Introduction
    • also known as beef tapeworm
  • Diseases
    • intestinal tapeworm
      • ingestion of encysted larvae (cysticerci) in undercooked beef
    • humans do NOT develop cysticercosis after ingesting eggs as with T. solium
  • Treatment
    • praziquantel

 

Diphyllobothrium latum
  • Introduction
    • also known as fish tapeworm
  • Diseases
    • intestinal tapeworm
      • ingestion of larvae in raw freshwater fish
      • can grow to 45 m in length
      • worm absorbs vitamin B12 causing a deficiency
        • can result in anemia
  • Treatment
    • praziquantel
Echinococcus granulosus/multilocularis
Echinococcus granulosus
  • Introduction
    • a form of tapeworm
  • Diseases
    • hydatid cyst disease 
      • humans ingest eggs from dog feces 
      • eggs hatch in intestine and larvae disseminate throughout the body
      • larvae form "hydatid" cysts in organs
        • especially liver
  • Treatment
    • bendazoles
    • surgical cyst resection
      • must be careful -- anaphylaxis will occur if antigens are released from cysts
      • surgeons inject ethanol into cysts to kill contents before attempting to remove them
 

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