The most common confirmatory test used to diagnose AIDS is

ELISA

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Western blot

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PCR

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None of the above

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Solution

The correct option is A ELISA
ELISA (enzyme-linked immunosorbent assay) is used to detect HIV infection. ELISA is the preliminary test in the diagnosis of AIDS. If ELISA test is positive, the Western blot test is usually administered to confirm the diagnosis.
Therefore, the correct answer is option B.

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