Question
A man working in a constructing company presented with watery, foul-smelling diarrhea since 3 weeks. There is no blood in the stools.Stool examination confirmed the presance of an organism shown in the picture below.It is best diagnosed by ?
A. Complement Fixation Test.
B. Presence of both cysts and trophozoites in stools.
C. Presence of cysts only.
D. Haemagglutination.
Show Answer
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Correct Answer » B
Explanation
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The organism shown in the picture above represents Giardia lamblia which causes giardiasis.
Watery (nonbloody), foul-smelling diarrhea is accompanied by nausea, anorexia, flatulence, and abdominal cramps persisting for weeks or months. There is no fever.
Diagnosis is made by finding trophozoites or cysts or both in diarrheal stools.
In formed stools (e.g., in asymptomatic carriers), only cysts are seen.
An ELISA test that detects a Giardia cyst wall antigen in the stool is also very useful.
Tests for antibody in the serum are not routinely available.
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