Fig. 5.

Phylogenetic relationships of H5N1 influenza viruses isolated from patients in China and from their environments during the 2008-2009 influenza season. Although no direct environmental samples are associated with it, A/Hubei/1/2010(H5N1), the most recent human clinical isolate, is also included in these phylogenetic trees. The human clinical isolates are shown in red. The environmental samples isolated from this study are shown in blue. The similarities between the clinical isolates and the environmental isolates are shown in Table S4 in the supplemental material.