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. 2017 Jan 26;14:6. doi: 10.1186/s12977-017-0331-z

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© The Author(s) 2017

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/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Surface CD4 molecules needed to produce 20% of maximum infectivity (EC₂₀), by subject and transmission type. The number of envelope sequences tested for each group (n) is shown. The grey box indicates the 95% confidence interval and the whiskers indicate the 99% confidence interval