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. 2015 Sep 25;10(9):e0138951. doi: 10.1371/journal.pone.0138951

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Fig 1 — The viruses were inoculated into eggs and grow at low (25°C), permissive (32°C), restrictive (38°C) temperatures. Infectious titers were measured by 50% egg infectious dose per milliliter (EID₅₀/ml).