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. 2009 Mar 18;4(3):e4857. doi: 10.1371/journal.pone.0004857

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Srivastava et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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DBA/2J (A) and C57BL/6J (B) mice were infected with increasing doses of PR8 virus via the intranasal route and survival was recorded for the following 14 days. Mortality includes also mice that were sacrificed because they had lost more than 25% of body weight.