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. 2007 May 11;3(5):e61. doi: 10.1371/journal.ppat.0030061

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© 2007 Munster 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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Data from all 332 virus isolates were included with the distribution of the HA subtypes shown in the top panel and the NA subtypes in the bottom panel.