ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (2): 382-389.doi: 10.11843/j.issn.0366-6964.2019.02.016

Previous Articles     Next Articles

Isolation, Identification and Genetic Evolution of H3 Subtype Avian Influenza Virus in Dongting Lake Region from 2011 to 2015

HE Shicheng1, PENG Zhi1*, WANG Weiguo1, TANG Xiaoming1, LU Xinghua1, LIN Yuan1, DENG Guohua2*, WANG Changjian1   

  1. 1. Hunan Animal Disease Prevention and Control Center, Changsha 410014, China;
    2. Animal Influenza Key Laboratory of the Ministry of Agriculture, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
  • Received:2018-07-31 Online:2019-02-23 Published:2019-02-23

Abstract:

To better understand the situation and evolution of poultry infected with H3 subtype avian influenza viruses around Dongting Lake, active monitoring at live-poultry markets and Free-range duck farms at this region were implemented in 2011-2015, and a total of 31 strains of H3 subtype AIV were isolated. Gene sequencing and evolutionary analysis of these strains were conducted in our study. Sequencing results showed that all the viruses were located in the Eurasian lineage except for two H3N8s in North America lineage, all isolates were low pathogenic avian influenza virus. Phylogenetic tree showed that PA and PB2 genes of some viruses were clustered with H5, while NP, PA and PB1 were clustered with H7, suggesting that complicated gene exchange were occurred. Internal genes of some viruses isolated from free-range poultry show very high homology with wild birds origin H3, H7, H11 from neighboring countries such as Vietnam and South Korea, may share the same evolutionary origin. Further genome sequence alignment can divided all viruses into 21 different genotypes. The source of H3 subtype avian influenza virus in the Dongting Lake area is complicated, showing a clear genetic diversity.

CLC Number: