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. 2009 Sep 8;6:137. doi: 10.1186/1743-422X-6-137

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Copyright © 2009 Chen et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The panorama phylogenetic tree of type A influenza virus based on the viral PB2 gene sequences. The tree could be divided into at least 8 lineages, and some lineage could be further divided into some sublineages. The distribution of host, isolation time, isolation regions and subtypes of the majority within each sublineages were shown near to the relevant designations. The current A(H1N1) virus corresponded to the sublineage S1.1.5 (at the top). Bootstrap values were given at relevant nodes.