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. 2013 Apr 24;2(4):e20. doi: 10.1038/emi.2013.20

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Copyright © 2013 Shanghai Shangyixun Cultural Communication Co., Ltd

This work is licensed under the Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

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Phylogenetic trees of the HA (A) and NA (B) genes of influenza viruses isolated from swine in the Llanos region of Colombia. Trees were generated by using the neighbor-joining method in MEGA software. Trees are based on full genetic sequences of representative pandemic H1N1 (red), classical swine H1N1 (yellow), seasonal human H1N1 (green) and seasonal human and swine H3N2 (blue) viruses. Swine isolates are shown in black italics. An archetypal 2009 pandemic H1N1 strain (A/California/04/2009) is shown in red. Scale bars represent the number of substitutions per site.