What is the key educational point about adherence and antiretroviral therapy (ART)?

• A. One missed dose has no impact.
• B. Adherence is not critical as long as viral load is detectable.
• C. Adherence only matters in the first week.
• D. High adherence (often 95% or higher) is critical to prevent resistance; missed doses can lead to virologic rebound and resistance.

Answer: (D)

The main idea is that maintaining very high adherence to antiretroviral therapy is essential to keep HIV suppressed and to prevent the virus from becoming resistant. When doses are taken consistently, drug levels stay in the therapeutic range and replication stays blocked, which helps keep the viral load undetectable and preserves immune function. Missing doses allows drug levels to fall, giving the virus a chance to replicate again. This virologic rebound increases the likelihood of resistance mutations developing, which can compromise current and future treatment options. Adherence is an ongoing requirement, not something that’s only important at the start. The other statements imply that missed doses don’t matter or that adherence isn’t needed after the virus is detectable, which isn’t true; staying adherent most of the time (often about 95% or higher, depending on the regimen) is required to prevent resistance and maintain viral suppression.