Question:
Which of the following materials is used as an antigen in Casoni's test?
Which of the following materials is used as an antigen in Casoni's test?
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Immunodiagnostic Antigens:
Casoni's Test (Echinococcosis) $\rightarrow$ Sterile Hydatid Fluid.
Mallein Test (Glanders) $\rightarrow$ Culture filtrate of Burkholderia mallei.
Tuberculin Test $\rightarrow$ PPD.
Casoni's Test (Echinococcosis) $\rightarrow$ Sterile Hydatid Fluid.
Mallein Test (Glanders) $\rightarrow$ Culture filtrate of Burkholderia mallei.
Tuberculin Test $\rightarrow$ PPD.
Updated On: Sep 7, 2026
- Hydatid fluid
- Adult worm
- Egg
- Protoscolices
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Immediate hypersensitivity intradermal skin testing for immunological detection of hydatidosis (echinococcosis).
Step 2: Detailed Explanation:
Casoni's Test (Tomaso Casoni, 1912):
- An immediate Type I hypersensitivity intradermal skin test used for the immunodiagnosis of cystic echinococcosis (Hydatid Disease, Echinococcus granulosus).
- The diagnostic antigen used is sterile, Seitz-filtered Hydatid Fluid collected aseptically from fertile hydatid cysts of slaughtered sheep or cattle.
- Intradermal injection of $0.1 - 0.2\text{ mL}$ of hydatid fluid produces a diagnostic wheal-and-flare erythematous skin reaction within 15--20 minutes in sensitized individuals.
Step 3: Final Answer:
Hence, Hydatid fluid is used as the antigen in Casoni's test, matching option (A).
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