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CAIE IGCSE Biology 16.6.3 HIV Infection May Lead to AIDS

Practise stating the relationship between HIV infection and AIDS accurately without treating progression as immediate or certain.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify HIV as the viral infection that reduces lymphocyte numbers and may progress to AIDS

16.6.3—HIV infection may lead to AIDS question 1

[Maximum number: 4]

Fig. 4.1 is a diagram of a virus.

Fig. 4.1

Fig. 4.1

The human immunodeficiency virus (HIV) infects and destroys lymphocytes.

The number of lymphocytes in the blood of a person infected with HIV was measured over a period of 84 months.

The results are shown in Fig. 4.2.
number of lymphocytes per mm3\mathrm{mm}^{3} of blood

Fig. 4.2

Fig. 4.2

Outline the consequences of the changes in the number of lymphocytes for the health of the person infected with HIV.

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