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. 2017 Jul 14;17:497. doi: 10.1186/s12879-017-2596-1

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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. 3 — Distribution of strains according to the size of urban centers. a Distribution of the strains from the IA Major cluster, IA minor cluster and IB cluster according to the size of urban centers (see the legend of Fig. 1). The percent values are shown. b Detail of the number of cases and relative frequency of the strains from the IA Major cluster (strain 1, strain 2 and strains related to strain 1 and 2) in LMCs and SCs