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Figure 2 | Virology Journal

Figure 2

From: The highly pathogenic H7N3 avian influenza strain from July 2012 in Mexico acquired an extended cleavage site through recombination with host 28S rRNA

Figure 2

Phylogenetic relationship between 205 H7N3 full-length HA nucleotide sequences collected from 2000 till 2012. Strains with extended cleavage sites representing high pathogenic avian influenza (HPAI) strains as reported in the literature were separated by geographical regions and different years of outbreak and were highlighted with 5 different colors indicated in the legend. The recent 2012 Mexican chicken farm outbreak arose from a cluster of originally low pathogenic strains and therefore independently acquired the extended cleavage site which likely switched the strain to highly pathogenic.

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