Avian influenza A H5N1 virus: a continuous threat to humans

Kelvin KW To; Kenneth HL Ng; Tak-Lun Que; Jacky MC Chan; Kay-Yan Tsang; Alan KL Tsang; Honglin Chen; Kwok-Yung Yuen

doi:10.1038/emi.2012.24

Figure 1

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Phylogenetic relationships of the haemagglutinin genes from the virus strain of the 2010 Hong Kong patient and other avian H5N1 influenza virus strains. The phylogenetic tree was constructed using the neighbour-joining method. The numbers of clades and subclades are based on the World Health Organization nomenclature on H5N1 virus and are indicated on the right panel. Two human H5N1 isolates identified in 2010 in Hubei province and Hong Kong are indicated in red.