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HIV test results from the NHBS pilot study at CDC. Solid line represents the flow of the CDC proposed algorithm for laboratory HIV diagnostics, the assays were performed as indicated in the package insert. Dotted line represents the flow of testing to identify acute infections that would be missed by the CDC proposed algorithm. IA: immunoassay; NAAT: nucleic acid amplification test; R: reactive; RR: repeatedly reactive; NR: non-reactive; AHI: acute, HIV infection.
