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Volume 17, Number 4—April 2011
Letter

Hemagglutinin 222 Variants in Pandemic (H1N1) 2009 Virus

Maria Beatrice Valli, Marina Selleri, Silvia Meschi, Paola Zaccaro, Donatella Vincenti, Eleonora Lalle, Maria Rosaria Capobianchi, and Stefano MenzoComments to Author 
Author affiliations: Author affiliation: National Institute for Infectious Diseases, Virology, Rome, Italy

Main Article

Figure

Phylogenetic relationships among 2,492 complete hemagglutinin (HA) genes of pandemic (H1N1) 2009. At the center, the whole neighbor-joining tree. On the left, enlargement of 2 regions of the tree including pure monophyletic D222G clusters, indicated in blue. On the right, enlargement of the monophyletic D222E virus cluster, including 98% of the global 222E isolates (red box). E222G variant isolates, as examples, respectively, from Italy (4), Norway (1), Sweden, and the United Kingdom, are indica

Figure. Phylogenetic relationships among 2,492 complete hemagglutinin (HA) genes of pandemic (H1N1) 2009. At the center, the whole neighbor-joining tree. On the left, enlargement of 2 regions of the tree including pure monophyletic D222G clusters, indicated in blue. On the right, enlargement of the monophyletic D222E virus cluster, including 98% of the global 222E isolates (red box). E222G variant isolates, as examples, respectively, from Italy (4), Norway (1), Sweden, and the United Kingdom, are indicated in blue. The sequence labels represent the Global Initiative on Sharing All Influenza Data serial numbers; those of particular interest for this study are indicated by the strain name or country of origin.

Main Article

References
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