Which test is used to monitor infectivity and treatment response in HIV infection?

Which test is used to monitor infectivity and treatment response in HIV infection?

• A. HIV RNA viral load
• B. CD4 count
• C. Western Blot
• D. ELISA

Answer: (A)

The main idea is that you need a measure that directly tracks how actively HIV is replicating. HIV RNA viral load does exactly that by quantifying the amount of viral RNA in the blood. It changes quickly in response to antiretroviral therapy, so a falling viral load shows the treatment is working, while a persistently detectable or rising load signals treatment failure or resistance and often prompts a change in therapy. An undetectable or very low viral load is also associated with markedly reduced infectivity. CD4 count, while important for assessing immune status and risk of opportunistic infections, does not directly measure viral replication and therefore isn’t as responsive to changes from treatment. Western blot and ELISA are diagnostic tools that detect antibodies or viral proteins; they establish infection status but are not used to monitor how much virus is circulating or how well treatment is working.

The main idea is that you need a measure that directly tracks how actively HIV is replicating. HIV RNA viral load does exactly that by quantifying the amount of viral RNA in the blood. It changes quickly in response to antiretroviral therapy, so a falling viral load shows the treatment is working, while a persistently detectable or rising load signals treatment failure or resistance and often prompts a change in therapy. An undetectable or very low viral load is also associated with markedly reduced infectivity.

CD4 count, while important for assessing immune status and risk of opportunistic infections, does not directly measure viral replication and therefore isn’t as responsive to changes from treatment. Western blot and ELISA are diagnostic tools that detect antibodies or viral proteins; they establish infection status but are not used to monitor how much virus is circulating or how well treatment is working.