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2014-10-06 21:02:04

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  1. What is a lid or cap-like covering on certain parasitic eggs?
  2. This is a ciliated larval stage that hatches from the egg in fresh water. It is the free swimming stage that enters the snail.
  3. What are Trematodes?
    Fluke parasites
  4. This is a sac containing undifferentiated germinal structures inside intermediate host.
  5. This is the larval stage within the sporocyst. Each of these give rise to many cercaria.
  6. This is the final larval stage in a snail. This is the infective stage for Schistosomes.
  7. In hermaphroditic flukes, this is the stage where cercaria shed its tail and forms a protective wall.
  8. Trematodes are classified by the site of infection. What are the two sites of infection?
    • Organ dwelling
    • Blood dwelling
  9. In blood dwelling trematodes, what is the adult shaped like?
  10. Where does Clonorchis sinensis reside in the human.
    The gullbladder
  11. What is the name of this organism?
    (Note the key features of this organism)

    Clonorchis Sinensis

    See the shoulders and the knob opposite of the operculum.
  12. What is the intermediate host of Fasciola hepatica?
    Aquatic plants (watercress)
  13. What are the normal, definiative hosts of Fasciola hepatica?
    Sheep, cattle, but humans can become infected.
  14. What are the symptoms of an infestation of Fasciola hepatica?
    Fever, hematomegaly (swelling of the liver beyond its normal size), eosinophilia, jaundice, bile duct obstruction, diarrhea, and anemia.
  15. Fasciola hepatica eggs look identical to which other egg?
    Fasciolopsis buski
  16. What are the symptoms of a Fasciolopsis buski infestation?
    Abdominal pain, nausea, diarrhea, anemia, intestional obstruction, symptoms mimicing duodenal ulcer.
  17. Where do Fasciolopsis buski reside in the human host?
    Small intestine
  18. Where do Paragonimus westermani reside in the human?
    The lungs
  19. What is the intermediate host of Paragonimus westermani?
  20. This egg was found in the small intestine. The patient has been having some fever and liver swelling. Which two organisms could it be?

    This is Fasciola hepatica. It can easily be confused with the eggs of Fasciolopsis buski.
  21. What are nematodes?
  22. What is the scientific name for whipworm?
    Trichuris trichiura
  23. What is the scientific name for pinworm?
    Enterobius vermicularis
  24. What is the common name for Ascaris lumbricoides?
    human roundworm
  25. Which species does this egg belong to?

    Schistosoma japonicum
  26. A patient has come to the doctor with complaints of pain in her chest and a cough that produces bloody sputum. She recently visited Asia and recalls consuming shellfish. 

    A sample was taken from her sputum and the following images were seen under the microscope:

    Which organism is this?
    Paragonimus westermani
  27. This is known as the Lung Fluke. What is it's scientific name?

    Paragonimus westermani