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Case 2: HIV Case Definition

You answered:

D The CD4 percentage of 12% meets criteria for HIV infection, stage 3 (AIDS).

This answer is correct. The 2008 CDC HIV case definition requires laboratory confirmation of HIV infection to meet the case definition for HIV infection. This new case definition consists of four HIV infection stages: stage 1, stage 2, stage 3 (AIDS), and stage unknown. This 2008 classification system eliminates the the clinical categories A and B, but retains the 26 AIDS-defining conditions in clinical category C. The HIV stage 3 (AIDS) criteria is met by a CD4 count less than 200 cells/mm3, a CD4 percentage less than 14%), or documentation of an AIDS-defining clinical condition.

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