tetano
Editor, Senior Moderator
Adrian Rambaut is Professor of Molecular Evolution, University of Edinburgh
Analysis and interpretation
The main findings of the phylogenetic analysis is that although the human cases are a H7N9 virus, this seems to be an independent reassortment of 3 avian viruses: the HA (H7) from a H7N3 virus, the NA (N9) from a H7N9 virus and the remaining segments from a H9N2 virus. Thus, interestingly, this is a new bringing together of H7 and N9 that we haven't observed in birds. Given the high frequency of reassortment in wild birds it is quite possible that it simply hadn't been sampled.
...
http://epidemic.bio.ed.ac.uk/influenza_H7N9
Analysis and interpretation
The main findings of the phylogenetic analysis is that although the human cases are a H7N9 virus, this seems to be an independent reassortment of 3 avian viruses: the HA (H7) from a H7N3 virus, the NA (N9) from a H7N9 virus and the remaining segments from a H9N2 virus. Thus, interestingly, this is a new bringing together of H7 and N9 that we haven't observed in birds. Given the high frequency of reassortment in wild birds it is quite possible that it simply hadn't been sampled.
...
http://epidemic.bio.ed.ac.uk/influenza_H7N9