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. 2020 Jul 24;11:1547. doi: 10.3389/fmicb.2020.01547

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Copyright © 2020 Li, Rivers, Mathis, Li, Velusamy, Nanduri, Van Beneden, Snippes-Vagnone, Lynfield, McGee, Chochua, Metcalf and Beall.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Expanding subgroups within emm type between 2016 and 2017. Unrooted maximum-likelihood trees are shown for all emm92 isolates (A), all emm82 isolates (C), and all emm49 isolates (E), identified through the Active Bacterial Core surveillance in 2016 and 2017. The expanding subgroup isolates are colored in red. The scale bar indicates expected change per site. Counts of expanding subgroup isolates (red) and non-expanding subgroup isolates (blue) in 2016 and 2017 are shown for emm92 (B), emm82 (D), and emm92 (F).