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Dear Editor,Since the first human infection of influenza A (H7N9) virus in Shanghai in February 2013 (Gao et al.,2013),the virus has rapidly spread out to 14 pr
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College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China“,”Schoo
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Dear Editor,Since the first human infection of influenza A (H7N9) virus in Shanghai in February 2013 (Gao et al.,2013),the virus has rapidly spread out to 14 provinces of China and caused more than 139 cases of human infection with 47 deaths as of December 1,2013 (Li et al.,2014).In 2014,258 new cases with 99 deaths were reported (as of April 8,2014),forming another infection peak in the new influenza season in China.Zhejiang and Guangdong Provinces have reported the majority of the cases of the new influenza season.The first re-emerging H7N9 virus was reported to have high identity to eariier ones with only five mutations in NA (Chen et al.,2013b),and implying the continuity of H7N9 infections from the previous influenza season would have featured the second H7N9 influenza virus season.
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