. 2017 Oct 4;66(5):665–672. doi: 10.1093/cid/cix869
© The Author(s) 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 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Distribution of influenza cases and controls by week of enrollment.