A positive ELISA screening result for HIV is usually confirmed by
- A. repeating the ELISA only
- B. the Western blot technique
- C. a blood culture on agar
- D. a chest X ray
Explanation
ELISA is sensitive but can give false positives, so Western blot, which separates the viral proteins and shows which antibodies are present, is used to confirm. Viruses cannot be cultured on ordinary agar, ruling that option out entirely.
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