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. 2015 Jun 27;12:22. doi: 10.1186/s12981-015-0062-y

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© Liu et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/h) applies to the data made available in this article, unless otherwise stated.

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The prevalence of predicted human immunodeficiency virus 1 drug resistance mutations in different drug classes among individuals experiencing virological failure to first-line antiretroviral treatment in Henan, China during 2010–2011. N+NN+ the existence of both nucleoside reverse transcriptase inhibitor (NRTI) and non-(N)NRTI resistance mutation, N+NN− the existence of NRTI but not NNRTI resistance mutations, N-NN+ the existence of NNRTI but not NRTI resistance mutations.