Fig. 3

Phylogenetic tree of the HA gene of avian influenza A(H7N9) virus in the 5th epidemic wave. a H7N9 viruses isolated from Yunnan province are shown in detail in the dotted boxes and are colored in red. Box 1, the isolates in Wenshan City; box 2, the imported strains in Kunming City. The tree is rooted with virus A/Shanghai/2/2013. b A partial map of China indicating the routes of viral spread leading to outbreaks in cities of Kunming and Wenshan. Abbreviations: KM, Kunming City; WS, Wenshan City. Kunming strains imported from Jiangxi Province are shown as a solid line. Wenshan strains imported from Guangxi Province are shown as a dotted line. (The map layers were provided and permitted to use in the study by China Center for Disease Control and Prevention)