16.6. Sexually transmitted infections
A subsection of Biology, 0610, through 16. Reproduction
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is a diagram of a virus. N O Identify the parts of the virus labelled N and O. N O The human immunodeficiency virus (Hinfects 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 . time after HIV infection / months number of lymphocytes per mm3 of blood Use the information shown in to calculate the percentage change in the number of lymphocytes from month 10 to month 60. Give your answer to two significant figures. Space for working. % Describe the changes in the number of lymphocytes, over the 84 months following infection with HIV, shown in . Outline the consequences of the changes in the number of lymphocytes for the health of the person infected with HIV. Explain why antibiotics are not used to treat viral infections.
0610_s22_qp_42
THEORY
2022
Paper 4, Variant 2
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