How much do you know about the life cycle and transmission of E

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Questions and Answers

Which organ acts as the first filter for E. granulosus parasites?

  • Liver (correct)
  • Small intestine
  • Duodenum
  • Lungs

How can humans acquire E. granulosus infection?

  • Through contaminated soil
  • Through direct contact with infected dogs (correct)
  • Through contact with infected birds
  • Through consuming raw meat

What type of cells are involved in the cellular reaction against E. granulosus parasites?

  • Lymphocytes
  • Eosinophils (correct)
  • Neutrophils
  • Monocytes

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Study Notes

  • E. granulosus has a life cycle that involves two hosts
  • The adult worm lives in the small intestine of dogs and other canines
  • Eggs are discharged in the feces and can be ingested by intermediate hosts
  • Humans can acquire the infection through direct contact with infected dogs or contaminated food/water
  • The oncospheres hatch in the duodenum and enter the portal vein
  • The liver acts as the first filter for the parasites
  • The lungs act as the second filter
  • Parasites can settle in various organs and cause a cellular reaction
  • Host defense mechanisms can destroy a large number of parasites
  • Eosinophils are involved in the cellular reaction against the parasite.

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