Human immunodeficiency virus (HIV) affects the immune system resulting in decreased lymphocyte numbers.
The diagnosis of AIDS can be made when lymphocyte numbers decrease below 200 cells /mm$^3$ of blood.
The graph shows the lymphocyte numbers after HIV infection in a patient.
How many years after infection would this patient be diagnosed with AIDS?
1 )
0 years
2 )
3 years
3 )
7 years
9 years
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