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BMC Infectious Diseases
Published in: BMC Infectious Diseases 1/2015

Open Access 01-12-2015 | Research article

Spatial, temporal and genetic dynamics of highly pathogenic avian influenza A (H5N1) virus in China

Authors: Huaiyu Tian, Yujun Cui, Lu Dong, Sen Zhou, Xiaowen Li, Shanqian Huang, Ruifu Yang, Bing Xu

Published in: BMC Infectious Diseases | Issue 1/2015

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Abstract

Background

The spatial spread of H5N1 avian influenza, significant ongoing mutations, and long-term persistence of the virus in some geographic regions has had an enormous impact on the poultry industry and presents a serious threat to human health.

Methods

We applied phylogenetic analysis, geospatial techniques, and time series models to investigate the spatiotemporal pattern of H5N1 outbreaks in China and the effect of vaccination on virus evolution.

Results

Results showed obvious spatial and temporal clusters of H5N1 outbreaks on different scales, which may have been associated with poultry and wild-bird transmission modes of H5N1 viruses. Lead–lag relationships were found among poultry and wild-bird outbreaks and human cases. Human cases were preceded by poultry outbreaks, and wild-bird outbreaks were led by human cases. Each clade has gained its own unique spatiotemporal and genetic dominance. Genetic diversity of the H5N1 virus decreased significantly between 1996 and 2011; presumably under strong selective pressure of vaccination. Mean evolutionary rates of H5N1 virus increased after vaccination was adopted in China. A clear signature of positively selected sites in the clade 2.3.2 virus was discovered and this may have resulted in the emergence of clade 2.3.2.1.

Conclusions

Our study revealed two different transmission modes of H5N1 viruses in China, and indicated a significant role of poultry in virus dissemination. Furthermore, selective pressure posed by vaccination was found in virus evolution in the country.
Appendix
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Metadata
Title
Spatial, temporal and genetic dynamics of highly pathogenic avian influenza A (H5N1) virus in China
Authors
Huaiyu Tian
Yujun Cui
Lu Dong
Sen Zhou
Xiaowen Li
Shanqian Huang
Ruifu Yang
Bing Xu
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2015
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/s12879-015-0770-x

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