Question
A known HIV patient on anti-retroviral therapy presented with diarrhea of six months duration. Stool microscopy was done in which 10-30 micrometer cysts were seen, Kinyoun stain was positive. What is the most likely diagnosis?
A. Cystoisospora
B. Cryptosporidium
C. Balantidium coli
D. Strongyloides
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Correct Answer » A
Explanation
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Ans. A. Cystoisospora
- Comparison of Coccidian Parasites Causing Diarrhea in Immunocompromised Host.
| Property |
Crytosporidium |
| Infective form |
- Sporulated oocyst Thick walled oocyst (80%) by contaminated food and water.
- Thin walled (20%) Thin walled (20%)
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| Sporulated oocyst |
4-6 p.m, round contains four sporo-zoites |
| Acid fastness Detection limit > 50,000 oocyst/ml stool |
Uniformly acid fast |
| Property |
Crytosporidium |
| Autofluorescence |
No, but can be stained with fluores cent dye |
| Sporulation of the oocyst |
Occurs inside the host cells (entero- cytes) |
| Diagnostic form |
Sporulated oocyst |
| Sporulated oocyst |
Seen |
| Treatment |
Nitazoxanide |
| Outbreaks |
Common |
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