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. 2022 May 17;22:474. doi: 10.1186/s12879-022-07453-9

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© The Author(s) 2022

Open AccessThis 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/. 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 in a credit line to the data.

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Fig. 3 — Variations in genotyping success rates, number and proportion of DBS specimens genotyped with time. The proportion of DBS specimens represents the number of DBS specimens being the numerator and the denominator being the total number of specimens we attempted to genotype in a particular year (see Table 1). The overall genotyping success rates (GSR) decreased as both the number and proportion of DBS specimens we attempted to genotype increased from 2016 to 2019