logitech
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psychotic, indigent man w/ a history of multisubstance abuse has been involuntarily hospitalized for 1 week. Because of persisten diarrhea, stools are sent for ova and parasites, revealingg numerous granular, spherical, thin-walles cysts measuring 10-20 mm in diameter. Trichrome stains show up to four nuclei in most of the cysts. These findings are consistent w/ which of the following organisms?
A. Cryptosporidium parvum
B. Dientamoeba fragilis
C. Entamoeba histolytica
D. Giardia lambia
E. Isospora belli
is it e.histoliica???/
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| amritt786
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think A
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| drgho
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Entamoeba histolytica
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| bactitech
Forum Elite
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Do not think A. C. parvum is much smaller than 10-20 microns (NOT mm!!!). Measurements are everything with parasites. You MUST measure any potential parasite before even considering identification. C. parvum is too small, and the other parasites mentioned have <4 nuclei. Nuclei are also important in parasites. Another clue - C. parvum does not show up on trichrome staining. You need either a carbol fuchsin acid fast stain or fluorescent stain to see them. So...answer is E. histolytica.
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| hope4dabest
Forum Elite
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i guess E but not sure
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| bactitech
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http://www.ufrgs.br/para-site/Imagensatlas/Protoz...
http://www.dpd.cdc.gov/dpdx/HTML/ImageLibrary/Iso...
This site gives measurements.....
Apparently you guys are not getting the message. I. belli has thick walls and 2 nuclei.
Key to parasite identification: MEASUREMENTS, number of nuclei, cyst or trophozoite form, patient history.
You cannot make a parasite fit the wrong measurements. You cannot change the number of nuclei. Read the question thoroughly.
http://www.dpd.cdc.gov/dpdx/
Check this CDC site - lots of great information.
http://www.dpd.cdc.gov/dpdx/HTML/ImageLibrary/Ame...
Entamoeba page - compares E. histolytica to E. coli - can be difficult for techs to differentiate between the two sometimes. This always shows up on our CAP unknowns.
My 0.02.....
Edited by bactitech on 09/10/07 - 11:27 AM
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Clinical Microbiology since 1974
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| unique1
InGodITrust
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Thank you bactitech. I did not know that measurements are that important .
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| po
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yes thank you for the links,very helpful.
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| hope4dabest
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thanks, even i didnt know measurements and nuclei were so important
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