N. Wang et al.. Avian Influenza (H7N9) Viruses Co-circulating among Chickens, Southern China. EID Vol 23, Dec 2017
In April 2017, three avian influenza (H7N9) viruses were isolated from chickens in southern China. Each virus had different insertion points in the cleavage site of the hemagglutinin protein compared to the first identified H7N9 virus. We determined that these viruses were double or triple reassortant viruses
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