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. 2021 Nov 29;11:23060. doi: 10.1038/s41598-021-02428-3

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Age and CD4⁺ T cell counts in individuals infected with HIV-1 subtype B or C. The 2D contour histograms represent the Age (years) in the y axis and CD4⁺ T cell counts (cells/mL) in the x axis for all studied cases of HIV-1 subtype B infection (n = 1675) and subtype C infection (n = 340). The color scale represents the frequency of cases from blue (lower) to pink (higher).