[Campbell Biology P.1022] Based on Figure 43.28, which statement most accurately describes th... | Practice Question

Based on Figure 43.28, which statement most accurately describes the progression of an untreated HIV infection?

  • A: Helper T cell concentration steadily increases over 10 years, indicating a strong immune response.
  • B: Anti-HIV antibody concentration significantly declines after the initial peak, showing immune system failure.
  • C: The relative HIV concentration remains low throughout the infection, suggesting effective viral suppression.
  • D: A decrease in Helper T cell concentration and a later rise in HIV concentration are observed, leading to the AIDS stage.

Explanation

Figure 43.28 clearly illustrates that in an untreated HIV infection, the Helper T cell concentration steadily declines over time, while the relative HIV concentration, after an initial peak and brief drop, begins to rise significantly again. This progressive loss of Helper T cells and increase in viral load ultimately leads to the onset of AIDS, which is characterized by severe immune impairment.