What is a commonly used screening method for the detection of HIV-1 antibodies?

• A. Western Blot
• B. Enzyme-Linked Immunosorbent Assays
• C. PCR
• D. IFA

Answer: (B)

Screening for HIV-1 antibodies relies on a test that is highly sensitive and suitable for handling many samples, which is why Enzyme-Linked Immunosorbent Assays are commonly used. An ELISA can detect antibodies to HIV-1 in serum or plasma and is readily automated for high throughput, making it ideal as a first-line screen. While Western blot is highly specific, it is more labor-intensive and typically used to confirm a positive screening result rather than screen large populations. PCR detects viral RNA, not antibodies, so it serves for detecting infection directly rather than antibody status. Indirect immunofluorescence assays can also detect HIV antibodies, but they require more manual interpretation and are not as efficient for screening as ELISA. Therefore, the most commonly used screening method for HIV-1 antibodies is ELISA.