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Prevalence, genetics, and transmissibility in ferrets of Eurasian avian-like H1N1 swine influenza viruses
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Prevalence, genetics, and transmissibility in ferrets of Eurasian avian-like H1N1 swine influenza viruses
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Prevalence, genetics, and transmissibility in ferrets of Eurasian avian-like H1N1 swine influenza viruses
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Journal Article
Prevalence, genetics, and transmissibility in ferrets of Eurasian avian-like H1N1 swine influenza viruses
2016
Overview
Pigs are important intermediate hosts for generating novel influenza viruses. The Eurasian avian-like H1N1 (EAH1N1) swine influenza viruses (SIVs) have circulated in pigs since 1979, and human cases associated with EAH1N1 SIVs have been reported in several countries. However, the biologic properties of EAH1N1 SIVs are largely unknown. Here, we performed extensive influenza surveillance in pigs in China and isolated 228 influenza viruses from 36,417 pigs. We found that 139 of the 228 strains from pigs in 10 provinces in China belong to the EAH1N1 lineage. These viruses formed five genotypes, with two distinct antigenic groups, represented by A/swine/Guangxi/18/2011 and A/swine/Guangdong/104/2013, both of which are antigenically and genetically distinct from the current human H1N1 viruses. Importantly, the EAH1N1 SIVs preferentially bound to human-type receptors, and 9 of the 10 tested viruses transmitted in ferrets by respiratory droplet. We found that 3.6% of children (≤10 y old), 0% of adults, and 13.4% of elderly adults (≥60 y old) had neutralization antibodies (titers ≥40 in children and ≥80 in adults) against the EAH1N1 A/swine/Guangxi/18/2011 virus, but none of them had such neutralization antibodies against the EAH1N1 A/swine/Guangdong/104/2013 virus. Our study shows the potential of EAH1N1 SIVs to transmit efficiently in humans and suggests that immediate action is needed to prevent the efficient transmission of EAH1N1 SIVs to humans.
Publisher
National Academy of Sciences
Subject
/ Animals
/ Antigens, Viral - immunology
/ Genetics
/ Genotype
/ Humans
/ Immunity
/ Influenza A Virus, H1N1 Subtype - pathogenicity
/ Influenza A Virus, H1N1 Subtype - physiology
/ Mice
/ Mustela
/ Orthomyxoviridae Infections - epidemiology
/ Orthomyxoviridae Infections - genetics
/ Orthomyxoviridae Infections - transmission
/ Orthomyxoviridae Infections - virology
/ Simian immunodeficiency virus
/ Swine
/ Viruses
