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C3.2.12—HIV infection and AIDS

HIV infection and AIDS explains how a specific barrier, pathogen interaction, immune mechanism or treatment response contributes to protection against infectious disease.

Syllabus
First assessment 2025
Objective
C3.2.12
Level
SL

Exam analysis

Chance of appearing7%of analysed past papers
Latest appearanceNovember 2024
Most common paperPaper1
Typical marks1

Common command terms

  • Identify
  • Explain
  • Discuss

Scoring notes

Common mistake
Confusing plasma cells, memory cells and helper T-cells in the activation sequence.

Recent exam appearances

November 2024Paper1 ["SL"] · TZ127[ 1 ]C3.2.12—HIV infection and AIDS
May 2021Paper1 ["SL"] · TZ226[ 1 ]C3.2.12—HIV infection and AIDS
November 2020Paper1 ["SL"] · TZ027[ 1 ]C3.2.12—HIV infection and AIDS
May 2019Paper1 ["SL"] · TZ128[ 1 ]C3.2.12—HIV infection and AIDS
November 2015Paper1 ["SL"] · TZ026[ 1 ]C3.2.12—HIV infection and AIDS
Practice this objective

Coverage 2010–2024 · Updated 16 Jul 2026

Concept essentials

  • HIV infection and AIDS has to be linked to the exact pathogen, cell, molecule or population process involved.
  • The biological effect of hiv infection and aids depends on the sequence from trigger to protective outcome.
  • Clear distinctions within hiv infection and aids prevent confusion with neighbouring immune responses.
  • Evidence for hiv infection and aids is strongest when mechanism and consequence are explained together.
ConceptIB Biology SL