Characterising routes of H5N1 and H7N9 spread in China using Bayesian phylogeographical analysis
Autor: | Chau Minh Bui, Edwin Nugroho Njoto, Dillon C Adam, Matthew Scotch, C. Raina MacIntyre |
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Rok vydání: | 2018 |
Předmět: |
0301 basic medicine
China Epidemiology Immunology lcsh:QR1-502 Hemagglutinins Viral Transportation Biology Influenza A Virus H7N9 Subtype medicine.disease_cause Microbiology Poultry Article lcsh:Microbiology Disease Outbreaks lcsh:Infectious and parasitic diseases law.invention 03 medical and health sciences Bayes' theorem law Zoonoses Virology Environmental health Influenza Human Drug Discovery Pandemic Case fatality rate medicine Animals Humans lcsh:RC109-216 Epidemics Influenza A Virus H5N1 Subtype virus diseases Bayes Theorem General Medicine Influenza A virus subtype H5N1 Vaccination Phylogeography 030104 developmental biology Infectious Diseases Transmission (mechanics) Influenza in Birds Parasitology Rural area |
Zdroj: | Emerging Microbes and Infections, Vol 7, Iss 1, Pp 1-8 (2018) Emerging Microbes & Infections |
ISSN: | 2222-1751 |
Popis: | Avian influenza H5N1 subtype has caused a global public health concern due to its high pathogenicity in poultry and high case fatality rates in humans. The recently emerged H7N9 is a growing pandemic risk due to its sustained high rates of human infections, and recently acquired high pathogenicity in poultry. Here, we used Bayesian phylogeography on 265 H5N1 and 371 H7N9 haemagglutinin sequences isolated from humans, animals and the environment, to identify and compare migration patterns and factors predictive of H5N1 and H7N9 diffusion rates in China. H7N9 diffusion dynamics and predictor contributions differ from H5N1. Key determinants of spatial diffusion included: proximity between locations (for H5N1 and H7N9), and lower rural population densities (H5N1 only). For H7N9, additional predictors included low avian influenza vaccination rates, low percentage of nature reserves and high humidity levels. For both H5N1 and H7N9, we found viral migration rates from Guangdong to Guangxi and Guangdong to Hunan were highly supported transmission routes (Bayes Factor > 30). We show fundamental differences in wide-scale transmission dynamics between H5N1 and H7N9. Importantly, this indicates that avian influenza initiatives designed to control H5N1 may not be sufficient for controlling the H7N9 epidemic. We suggest control and prevention activities to specifically target poultry transportation networks between Central, Pan-Pearl River Delta and South-West regions. |
Databáze: | OpenAIRE |
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