Objectives To analyze the traceability and genetic characteristics of a highly pathogenic H7N9 avian influenza virus strain isolated in Nanning city,2017 through sequencing of hemagglutinin(HA) and neuraminidase(NA)gene of the virus.Methods Both HA and NA gene sequences of the isolated virus were amplified with real-time reverse transcription PCR(RT-PCR) and sequenced with Basic Local Alignment Search Tool(BLAST) database of National Center for Biotechnology Information(NCBI).The phylogenic tree analysis wa...