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ELISA is an fundamental tool of clinical immunology and is used as an initial screen for HIV detection.

1. ELISA is a fundamental tool of clinical immunology.
2. It is used as an initial screen for HIV detection.
3. It is a diagnostic test for HIV.
4. None of the above.

Correct answer: It is used as an initial screen for HIV detection.

Solution

ELISA is widely used in immunology, but the key point here is its application as an initial screening test for HIV. Screening tests are designed to be sensitive and catch possible positives early, which is why ELISA is used before confirmatory tests.

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