Global Dissemination and Evolution of H5 Highly Pathogenic Avian Influenza Virus

doi:10.11924/j.issn.1000-6850.casb17100006

Abstract

Abstract: S[Objective] Since 1996, H5 Highly Pathogenic Avian Influenza Virus (HPAIV) has been transmitted all over the world and continued to rapidly evolve. It became a disaster for the poultry industry and a threat for wild birds and mammals. To control and prevent the disease, it’s important to study understanding its outbreaks, spread and evolution. This study aimed to study the outbreaks, spread and evolution of H5 HPAIV, and figure out how the behavior of hosts and geographic environment influence the outbreaks and evolution of H5 HPAI. It will provide provide suggestions and theoretical support for the prevent and control of avian influenza.[Method] We applied phylogenetic analysis and geospatial techniques to investigate the spatiotemporal pattern of H5 Highly Pathogenic Avian Influenza Virus (from 2004 to 2015) transmission, outbreaks and evolution. [Result] There are twice geographical dispersion of H5 Highly Pathogenic Avian Influenza Virus, one is from 2005 to 2008 with one virus subtype (H5N1), and one is from 2014 to 2015 with many subtypes such as H5N2, H5N1, and H5N8. Besides, the genetic distance in different regions showed that in some regions, such as China, the local persistent viruses and different hosts might lead to the variation of genetic distance; and in some regions, such as South Asia and North America. [Conclusion] The geographic isolation and different hosts might contribute to the insignificant difference of viruses.

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