The Lancet  
Jun 01, 2013  Volume 381  Number 9881  p1877 – 1958  e16 – 17
http://www.thelancet.com/journals/lancet/issue/current

Human infections with the emerging avian influenza A H7N9 virus from wet market poultry: clinical analysis and characterisation of viral genome
Yu Chen, Weifeng Liang, Shigui Yang, Nanping Wu, Hainv Gao, Jifang Sheng, Hangping Yao, Jianer Wo, Qiang Fang, Dawei Cui, Yongcheng Li, Xing Yao, Yuntao Zhang, Haibo Wu, Shufa Zheng, Hongyan Diao, Shichang Xia, Yanjun Zhang, Kwok-Hung Chan, Hoi-Wah Tsoi, Jade Lee-Lee Teng, Wenjun Song, Pui Wang, Siu-Ying Lau, Min Zheng, Jasper Fuk-Woo Chan, Kelvin Kai-Wang To, Honglin Chen, Lanjuan Li, Kwok-Yung Yuen
http://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2813%2960903-4/abstract

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Cross species poultry-to-person transmission of this new reassortant H7N9 virus is associated with severe pneumonia and multiorgan dysfunction in human beings. Monitoring of the viral evolution and further study of disease pathogenesis will improve disease management, epidemic control, and pandemic preparedness.

Origin and diversity of novel avian influenza A H7N9 viruses causing human infection: phylogenetic, structural, and coalescent analyses
Di Liu, Weifeng Shi, Yi Shi, Dayan Wang, Haixia Xiao, Wei Li, Yuhai Bi, Ying Wu, Xianbin Li, Jinghua Yan, Wenjun Liu, Guoping Zhao, Weizhong Yang, Yu Wang, Juncai Ma, Yuelong Shu, Fumin Lei, George F Gao
http://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2813%2960938-1/abstract

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The novel avian influenza A H7N9 virus might have evolved from at least four origins. Diversity among isolates implies that the H7N9 virus has evolved into at least two different lineages. Unknown intermediate hosts involved might be implicated, extensive global surveillance is needed, and domestic-poultry-to-person transmission should be closely watched in the future.