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. 2011 Nov 16;6(11):e27625. doi: 10.1371/journal.pone.0027625

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Elisa F. Long.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The cost-effectiveness of NAAT (solid line) or fourth-generation immunoassay (dashed line) testing of MSM, given variations in undiagnosed HIV prevalence among MSM. Testing occurs annually (black line) or every six months (grey line), and cost-effectiveness of NAAT is relative to screening with fourth-generation immunoassay only. MSM = men who have sex with men; NAAT = nucleic acid amplification test; 4G = fourth-generation immunoassay; QALY = quality-adjusted life year.