Discussion
The confirmatory test for HIV virus causing AIDS is:
Answer: B
The Western blot is the confirmatory test for HIV. It separates viral proteins by electrophoresis and detects antibodies to specific ones, so a positive result is highly specific.
The ELISA is the screening test: it is very sensitive and cheap, but gives false positives, so every reactive ELISA is confirmed by Western blot before a diagnosis is made.
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