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. 2021 Jun 24;8:597630. doi: 10.3389/fvets.2021.597630

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Copyright © 2021 Kim and Cho.

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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Epidemic curve of HPAI outbreaks in Korea between 2003 and 2018. (A) Weekly epidemic case number of HPAI subtype H5N1 from 2003 to 2011. (B) Weekly epidemic case number of HPAI subtype H5N8 from 2014 to 2017. (C) Weekly epidemic case number of HPAI subtype H5N6 from 2016 to 2018. The x-axis represents the week numbers, which were based on the ISO 8601 week date system.