17. A small lemon-shaped cyst is present in the permanent stained smear, and it

Question

17. A small lemon-shaped cyst is present in the permanent stained smear, and it has a single nucleus and a curved fibril that has been called "the shepherd's crook" this organism is most likely: a. Pentatrichomonas hominis b. Enteromonas hominis c. Retortamonas intestinalis d. Chilomastix mesnili 18. If a patient has watery diarrhea, the stage in the life cycle of the intestinal protozoa that is most likely to be seen in the permanent stained smear is the: a. Cyst b. Precyst c. Trophozoite d. Pretrophozoite 19.An amebic cyst measuring 9 um and containing four nuclei and chromatoidal bars with smooth, rounded ends is most likely a. Endolimax nana b. Entamoeba hartmanni c. lodamoeba bütschlii d. Entamoeba histolytica 20. As an aid to identification of parasites, the ocular micrometer must be calibrated. Complete the following problem: An object measures eight units. What is its size in microns? Low Power Stage Ocular Units .31 .35 45 .25 .32 a. 14 um b. 112 um c. 60 umm d. 98 unm 21-25. Select the single best aid to diagnosis for each disease given: 25. Babesiosis 21. sleeping sickness 22, --. Trichomonas vaginalis 23 24. Cutaneous leishmeniasis Dysentery e. Skin scraping a. Blood Smear b. Vaginal sample or smear c. Fecal smear d. CSF

Explanation / Answer

17. D. Chilomastix mesnili

18.c.trophozoite

Trophozoites of E.histolyica are only seen in diarrheal stool. Cysts are seen in formed stool.

19. D. Entamoeba histolytica

E.histolytica is the only one which has 4 nuclei. It also has cart wheel appearance nucleus.

21. Sleeping sickness - CSF

Trichomonas vaginalis - VA ginal sample or smear

Dysentery - fecal smear

Cutaneous leishmaniasis -skin scraping

Babesiosis -blood smear

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