Normal ratio of CD4 (T4) : CD8 (T8) is_________________?
Correct answer: A. 2:1
- A. 2:1
- B. 1:2
- C. 3:1
- D. 1:3
Explanation
In healthy adults, CD4 helper T cells usually outnumber CD8 cytotoxic T cells, giving a CD4:CD8 ratio of about 2:1. HIV infection commonly lowers this ratio by depleting CD4 cells.
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Practise Immunology
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