Parasitology

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Author:
ncrook
ID:
214546
Filename:
Parasitology
Updated:
2013-05-31 20:03:57
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Extraintestinal Protozoa
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Description:
Extraintestinal Protozoa
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  1. How is malaria spread?
    Occurs with the bite of a female Anopheles mosquito that harbors the infective sporozoites in the salivary gland
  2. What stains are used to see Plasmodium species and what do they look like?
    • Wright stain
    • Giemsa stain
    • Shows a blue cytoplasmic ring connected to a red chromatin dot
  3. What protozoa species cause malaria?
    • Plasmodium vivax
    • Plasmodium falciparium
    • Plasmodium malariae
    • Plasmodium ovale
  4. What is the infective stage of Plasmodium species?
    Sporozoite is the infective stage transmitted to humans by female Anaopheles mosquitos
  5. What part of the life cycle of Plasmodium is the stage that invades erythrocytes?
    Merozoites are produced that invade RBCs
  6. What is the term for referring to the condition that occur after several weeks, the parasites can increase in number and the symptoms will return?
    Recrudescence
  7. What Plasmodium species:
    Has Shuffner's dots - usually present in all infected RBCs except with early ring forms
    Number of merozoites - 16 (12-24)
    Infected RBCs enlarged
    Trophozoites are irregular shaped
    Plasmodium vivax
  8. What plasmodium species:
    Has NO Shuffner's dots seen in peripheral blood
    Multiple ring forms see in single RBC
    Crescent shaped gametes ring shaped young trophozoites are only forms seen
    Plasmodium falciparum
  9. What plasmodium species:
    Has NO Shuffner's dots
    Number of merozoites: 8 (6-12)
    Infected RBCs normal in size and color
    Trophozoites compact and band forms may be seen
    Plasmodium malariae
  10. What plasmodium species:
    Shuffner's dots are usually present in all infected RBCs
    Number of merozoites: 9 (8-12)
    Infected RBCs are enlarged and often shaped with fimbriated edges
    Trophozoites irregular shaped
    Plasmodium ovale
  11. If you see crescent or banana shaped gametocytes, what are they diagnostic of?
    Plasmodium falciparium
  12. P. vivax
  13. P. falciparum
  14. P. malariae
  15. P. ovale
  16. What protozoa:
    Causes babesiosis
    Is also an erythrocytic intracellular parasite
    Has 2-4 rings per RBC are often seen, sometimes appearing like a "Maltese cross"
    Babesia microti
  17. Babesia microti
  18. What clinical conditions are associated with Babesia microti?
    • Babesiosis: affects the spleen, liver, and kidneys
    • Erythrocytic intracellular parasite: causing hemolytic anemia
  19. What protozoa:
    Has a predilection for CNS infections
    Can occur in premature or antibody deficient infants, where symptoms inclue splenomegaly, jaundice, and fever
    Spread by the ingestion of cat feces, undercooked lamb and pork
    Diagnosis is by serologic testing for antibodies
    Toxoplasma gondii
  20. What protozoa causes amebic meningoencephalitis, which is often fatal within 3-6 days
    Naegleri flowleri
  21. What protozoa is diagnosed by finding the cyst or trophozoite stages in CSF?
    Acathamoeba
  22. Acathamoeba
  23. What protozoa:
    Causes vaginitis in women, whereas men are generally asymptomatic carriers
    Are motile, with an undulating membrane
    Pear shaped
    Trichomonas vaginalis
  24. Trichomonas vaginalis
  25. Where are hemoflagellates found?
    Hemoflagellates inhabit the blood and tissues of humans
  26. What protozoa
    Causes African trypanosomiasis or sleeping sickness
    Infection affects the lymphatic system and CNS
    Trypansoma brucei
  27. Trypanosoma trypomastigote
  28. What protozoa causes Chagas disease or American trypanosomiasis, which is characterized by lesion formation (chagoma), conjuctivitis, edema of the face and legs, and heart muscle involvement leading to myocarditis
    Trypansoma cruzi
  29. Trypansoma cruzi
  30. What is diagnositic when finding the amastigote in the blood or tissue plus serologic testing?
    Leishmania
  31. What does Leishmania cause?
    • Cutaneous leishmainiasis: skin and mucous membrane ulcers
    • Disseminated leishmaniasis: liver, spleen, and reticuloendothelial involvement
  32. Leishmania

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