Answers are grounded in this paper and cite their sources.
Highly pathogenic avian influenza virus (H5N1) (QH09) was isolated from dead wild birds (3 species) in Qinghai, China, during May-June 2009. Phylogenetic and antigenic analyses showed that QH09 was clearly distinguishable from classical clade 2.2 viruses and belonged to clade 2.3.2.
No takes yet. Share an insight, caveat, or question.
Li et al. (2011) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: