Volume 18, Number 7—July 2012
Dispatch
Human Infection from Avian-like Influenza A (H1N1) Viruses in Pigs, China
Figure 1

Figure 1. Phylogenetic tree of selected swine, human, and avian H1 hemagglutinin 1 sequences. An unrooted phylogenetic tree was generated by the distance-based maximum-likelihood method by using MEGA5 software (www.megasoftware.net). Bootstrap values were calculated on the basis of 1,000 replications; A/swine/Jiangsu/40/2011 is in boldface.
1These authors contributed equally to this article.
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