Parasitology

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Author:
ncrook
ID:
214558
Filename:
Parasitology
Updated:
2013-05-31 21:46:34
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Trematodes Cestodes
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Description:
Trematodes and Cestodes
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  1. What is the final stage of development occurring in snails (trematodes) and are motile by means of a tail?
    Cercaria
  2. What is the term of an encysted form occurring in the 2nd intermediate host (fish or crayfish) in trematodes?
    Metacercaria
  3. What is the first larval stage of trematodes that emerges from the egg in fresh water?
    Miracidium
  4. In trematodes, what emerges from the miracidium as a saclike structure containing the larva?
    Sporocyst
  5. In trematodes, what is the intermediate larval stage occurring in the sporocyst?
    Redia
  6. In trematodes, what is the resulting form when the cercaria penetrates human skin and loses its tail?
    Schistosomulum
  7. What is the stage of trematodes that is infective to humans, in whom they are acquired by swimming in infested water?
    Cercariae
  8. What trematode:
    Symptoms: DERMATITIS, FEVER, COUGH, MALAISE, HEPATO-SPLENOMEGALY, CIRRHOSIS, BLOODY DIARRHEA, BOWEL OBSTRUCTION, PATIENTS FREQUENTLY DEVELOP BLADDER CANCER
    Diagnosis: EGGS IN URINE OR BLADDER BIOPSY WITH LARGE TERMINAL SPINE
    Schistosoma haematobium egg
  9. Schistosoma haematobium egg
  10. What trematode is EGGS IN STOOL OR RECTAL BIOPSY WITH A LARGE LATERAL SPINE
    Schistosoma mansoni egg
  11. Schistosoma mansoni egg
  12. What trematode is diagnosed with EGGS IN STOOL OR RECTAL BIOPSY WITH OVAL WITH SMALL LATERAL SPINE
    Schistosoma japonicum egg
  13. Schistosoma japonicum egg
  14. What trematode:
    Diagnosis: EGGS IN SPUTUM AND/OR STOOL WITH OPERCULUM WITH RIM, TERMINAL END THICKENING, AND SMOOTH SHELL
    Hosts: 1ST - SNAIL and 2ND - CRABS OR CRAYFISH
    Paragonimus westermani egg
  15. Paragonimus westermani egg
  16. What trematode:
    Diagnosis: EGGS IN STOOL OR DUODENAL ASPIRATE WITH OPERCULUM W/ THICKENED RIM, TERMINAL KNOB, and VERY SMALL
    Hosts: 1ST - SNAIL, 2ND - FRESHWATER FISH
    Clonorchis sinensis (Chinese or oriental liver fluke)
    • Chonorchis sinensis egg
    • (Chinese or oriental liver fluke)
  17. What trematode:
    Diagnosis: EGGS IN STOOL HAVE HUGE FORM HAVE AN OPERCULUM (NO TERMINAL KNOB)
    Hosts: 1ST - SNAIL, 2ND - WATER PLANTS (WATER CHESTNUTS OR BAMBOO SHOOTS
    Faciolopsis buski (intestinal flukes)
    • Fasciolopsis buski
    • (intestinal flukes)
  18. What trematode:
    Diagnosis: Egg detection in stool sample
    Morphology: Eggs are larg, oblong, and contain and operculum
    Fasciola hepatic (liver fluke)
    • Fasciola hepatic egg
    • (liver fluke)
  19. What cestode:
    Infection is by the ingestion of undercooked beef that contains the cysticercus larvae
    Diagnosis: Microscopic analysis for ova (species of Taenia eggs are identical), species ID relies on proglattid or scolex analysis
    Taenia saginata
  20. Taenia saginata
  21. What cestode:
    Infection is by the ingestion of undercooked pork that contains the cysticercus larvae
    Diagnosis: HEXACANTH EMBRYO (W/ HOOKS), 3 PAIRS OF HOOKLETS, THICK ROUND SHELL WITH RADIAL STRIATIONS
    Hosts: COW, MAN (ACCIDENTAL - WHEN CYSTICERCOSIS OCCURS)
    Taenia solium
  22. Taenia solium
  23. What happens when humans are the intermediate host following the ingestion of Taenia solium ova?
    Causes a larval form of extraintestinal disease called cysticercosis - which causes lesions in the cerebral cortex and other body sites that can be fatal
  24. What cestode:
    Infection is acquired by eating raw or undercooked fish containing the pleurocercoid
    Diagnosis: EGGS IN STOOL, SCOLEX OR PROGLATTIDS ALSO POSSIBLE,  OPERCULUM AND TERMINAL KNOB, UNDEVELOPED CORADIUM LARVA
    Hosts: COPEPOD and FRESHWATER FISH
    Diphyllobothrium latum (fish tapeworm)
    • Diphyllobothrium latum egg
    • (fish tapeworm)
  25. What cestode:
    Humans usually acquire the infection by ingestion of ova found in mice or human feces
    Diagnosis: EGGS IN STOOL                        COLORLESS SHELL, HEXANCANTH EMBRYO (W/ HOOKS), 3 PAIRS OF HOOKLETS, BIPOLAR FILAMENTS OR THICKENINGS
    Hymenolepis nana (dwarf tapeworm)
    • Hymenolepis nana
    • (dwarf tapeworm)
  26. What cestode:
    Humans acquire infection from the ingestion of insects containing the cystericercoids
    Hymenolepis diminuta (mouse and rat tapeworm)
  27. What cestode:
    Human infection results in the development of a hydatid cyst in many body sites (hydatid disease)
    Echinococcus granulosus (dog tapeworm)
    • Echinococcus granulosus
    • (dog tapeworm)

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