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. 2017 Aug 7;216(6):697–702. doi: 10.1093/infdis/jix393

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© The Author 2017. Published by Oxford University Press for the Infectious Diseases Society of America.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 2. — Percentage distribution of influenza B(Victoria) cases (A) and influenza B(Yamagata) cases (B) and test-negative controls by single-year age group, Canadian Sentinel Practitioner Surveillance Network (SPSN), 2010–2011 to 2015–2016. The percentage of all cases of the specified influenza B lineage belonging to a given age (in years) is displayed as a bar graph; the same information for test-negative controls is superimposed as a dotted line for comparison purposes to indicate the sampling distribution by age in the overall SPSN sample.