Emergence and development of H7N9 influenza viruses in China

•H7N9 virus was generated through sequential reassortments in ducks and chickens.•This virus originated from eastern China and has spread to over 20 provinces.•Regionally distinct lineages have been established with different genotypes.•Viruses present at live poultry markets fueled the recurrence o...

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Published inCurrent opinion in virology Vol. 16; pp. 106 - 113
Main Authors Zhu, Huachen, Lam, Tommy Tsan-Yuk, Smith, David Keith, Guan, Yi
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.02.2016
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ISSN1879-6257
1879-6265
1879-6265
DOI10.1016/j.coviro.2016.01.020

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Abstract •H7N9 virus was generated through sequential reassortments in ducks and chickens.•This virus originated from eastern China and has spread to over 20 provinces.•Regionally distinct lineages have been established with different genotypes.•Viruses present at live poultry markets fueled the recurrence of human infections.•Chickens served as the source of human infections in each outbreak wave. The occurrence of human infections with avian H7N9 viruses since 2013 demonstrates the continuing pandemic threat posed by the current influenza ecosystem in China. Influenza surveillance and phylogenetic analyses showed that these viruses were generated by multiple interspecies transmissions and reassortments among the viruses resident in domestic ducks and the H9N2 viruses enzootic in chickens. A large population of domestic ducks hosting diverse influenza viruses provided the precondition for these events to occur, while acquiring internal genes from enzootic H9N2 influenza viruses in chickens promoted the spread of these viruses. Human infections effectively act as sentinels, reflecting the intensity of the activity of these viruses in poultry.
AbstractList The occurrence of human infections with avian H7N9 viruses since 2013 demonstrates the continuing pandemic threat posed by the current influenza ecosystem in China. Influenza surveillance and phylogenetic analyses showed that these viruses were generated by multiple interspecies transmissions and reassortments among the viruses resident in domestic ducks and the H9N2 viruses enzootic in chickens. A large population of domestic ducks hosting diverse influenza viruses provided the precondition for these events to occur, while acquiring internal genes from enzootic H9N2 influenza viruses in chickens promoted the spread of these viruses. Human infections effectively act as sentinels, reflecting the intensity of the activity of these viruses in poultry.The occurrence of human infections with avian H7N9 viruses since 2013 demonstrates the continuing pandemic threat posed by the current influenza ecosystem in China. Influenza surveillance and phylogenetic analyses showed that these viruses were generated by multiple interspecies transmissions and reassortments among the viruses resident in domestic ducks and the H9N2 viruses enzootic in chickens. A large population of domestic ducks hosting diverse influenza viruses provided the precondition for these events to occur, while acquiring internal genes from enzootic H9N2 influenza viruses in chickens promoted the spread of these viruses. Human infections effectively act as sentinels, reflecting the intensity of the activity of these viruses in poultry.
The occurrence of human infections with avian H7N9 viruses since 2013 demonstrates the continuing pandemic threat posed by the current influenza ecosystem in China. Influenza surveillance and phylogenetic analyses showed that these viruses were generated by multiple interspecies transmissions and reassortments among the viruses resident in domestic ducks and the H9N2 viruses enzootic in chickens. A large population of domestic ducks hosting diverse influenza viruses provided the precondition for these events to occur, while acquiring internal genes from enzootic H9N2 influenza viruses in chickens promoted the spread of these viruses. Human infections effectively act as sentinels, reflecting the intensity of the activity of these viruses in poultry.
•H7N9 virus was generated through sequential reassortments in ducks and chickens.•This virus originated from eastern China and has spread to over 20 provinces.•Regionally distinct lineages have been established with different genotypes.•Viruses present at live poultry markets fueled the recurrence of human infections.•Chickens served as the source of human infections in each outbreak wave. The occurrence of human infections with avian H7N9 viruses since 2013 demonstrates the continuing pandemic threat posed by the current influenza ecosystem in China. Influenza surveillance and phylogenetic analyses showed that these viruses were generated by multiple interspecies transmissions and reassortments among the viruses resident in domestic ducks and the H9N2 viruses enzootic in chickens. A large population of domestic ducks hosting diverse influenza viruses provided the precondition for these events to occur, while acquiring internal genes from enzootic H9N2 influenza viruses in chickens promoted the spread of these viruses. Human infections effectively act as sentinels, reflecting the intensity of the activity of these viruses in poultry.
Author Smith, David Keith
Lam, Tommy Tsan-Yuk
Guan, Yi
Zhu, Huachen
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  givenname: Tommy Tsan-Yuk
  surname: Lam
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  givenname: David Keith
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  givenname: Yi
  surname: Guan
  fullname: Guan, Yi
  organization: Joint Influenza Research Centre (SUMC/HKU), Shantou University Medical College, Shantou 515041, China
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Snippet •H7N9 virus was generated through sequential reassortments in ducks and chickens.•This virus originated from eastern China and has spread to over 20...
The occurrence of human infections with avian H7N9 viruses since 2013 demonstrates the continuing pandemic threat posed by the current influenza ecosystem in...
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SubjectTerms Animals
Chickens
China - epidemiology
Communicable Diseases, Emerging
Ducks
Evolution, Molecular
Genotype
Humans
Influenza A Virus, H7N9 Subtype - classification
Influenza A Virus, H7N9 Subtype - genetics
Influenza A Virus, H7N9 Subtype - isolation & purification
Influenza in Birds - epidemiology
Influenza in Birds - transmission
Influenza in Birds - virology
Influenza, Human - epidemiology
Influenza, Human - transmission
Influenza, Human - virology
Phylogeny
Reassortant Viruses
Risk Factors
Title Emergence and development of H7N9 influenza viruses in China
URI https://dx.doi.org/10.1016/j.coviro.2016.01.020
https://www.ncbi.nlm.nih.gov/pubmed/26922715
https://www.proquest.com/docview/1779021587
https://www.proquest.com/docview/1790959341
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