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. 2018 Mar 1;34(3):314–318. doi: 10.1089/aid.2017.0244

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© Mary A. Rodgers et al. 2018; Published by Mary Ann Liebert, Inc.

This Open Access article is distributed under the terms of the Creative Commons License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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FIG. 1. — Summaries of demographics. The country, sex, and age at the time of specimen collection are plotted in pie charts as percentages of the total number of samples (N = 199). The full age range of the study cohort is 18–54 years with a median age of 34 years.