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. 2016 May 31;7(3):e00403-16. doi: 10.1128/mBio.00403-16

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Copyright © 2016 Beres et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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FIG 1 — Temporal and geographic distribution of the emm89 strain cohort. Shown is the temporal distribution of the emm89 strains by clade. The inset shows the geographic distribution of the isolates by country. The colored horizontal bars at the bottom of the figure show the temporal distribution of the strains by country. A single isolate from Italy is not illustrated. The reduced numbers of cases in 2014 are due to United States isolates not being available for study rather than to a decline in the frequency of infections. Clade 3 strains emerged in 2003 and expanded greatly in number, displacing the predecessor clade 1 and 2 strain samples studied in all 3 populations (United States, Finland, and Iceland).