Fourth-generation HIV tests differ from earlier generations by detecting antibodies and which viral component?

Fourth-generation HIV tests differ from earlier generations by detecting antibodies and which viral component?

• A. HIV RNA
• B. p24 antigen
• C. HIV DNA
• D. HIV reverse transcriptase

Answer: (B)

Fourth-generation HIV tests expand beyond antibodies by also detecting a viral component that appears early in infection. They look for HIV antibodies and the p24 antigen, a core protein of the virus. p24 shows up in the blood before the body makes detectable antibodies, so this combination shortens the window period and allows earlier identification of infection. HIV RNA detection uses nucleic acid testing and isn’t part of the standard fourth-generation screening; HIV DNA and the enzyme reverse transcriptase aren’t the targets of these tests. So the viral component detected alongside antibodies in fourth-generation tests is the p24 antigen.

Fourth-generation HIV tests expand beyond antibodies by also detecting a viral component that appears early in infection. They look for HIV antibodies and the p24 antigen, a core protein of the virus. p24 shows up in the blood before the body makes detectable antibodies, so this combination shortens the window period and allows earlier identification of infection. HIV RNA detection uses nucleic acid testing and isn’t part of the standard fourth-generation screening; HIV DNA and the enzyme reverse transcriptase aren’t the targets of these tests. So the viral component detected alongside antibodies in fourth-generation tests is the p24 antigen.