ZHANG Y, Mao H, Yan J, Zhang L, et al. Isolation and characterization of H7N9 avian influenza A virus from humans with respiratory diseases in Zhejiang, China. Virus Res. 2014 May 24. pii: S0168-1702(14)00183
In 2013, the novel reassortant avian-origin influenza A (H7N9) virus was reported in China. Through enhanced surveillance, infection by the H7N9 virus in humans was first identified in Zhejiang Province. Real-time reverse-transcriptase-polymerase-chain-reaction (RT-PCR) was used to confirm the infection. Embryonated chicken eggs were used for virus isolation from pharyngeal swabs taken from infected human patients. The H7N9 isolates were first identified by the hemagglutination test and electron microscopy, then used for whole genome sequencing. Bioinformatics software was used to construct the phylogenetic tree and for computing the mean rate of evolution of the HA gene in H7Nx and NA in HxN9. Two novel H7N9 avian influenza A viruses (A/Zhejiang/1/2013 and A/Zhejiang/2/2013) were isolated from the positive infection cases. Substitutions were found in both Zhejiang isolates and were identified as human-type viruses. All phylogenetic results indicated that the novel reassortant in H7N9 originated in viruses that infected birds. The sequencing and phylogenetic analysis of the whole genome revealed the mean rate of evolution of the HA gene in H7NX to be 5.74E-3 (95% Highest posterior density: 3.8218E-3 to 7.7873E-3) while the NA gene showed 2.243E-3 (4.378E-4 to 3.79E-3) substitutions per nucleotide site per year. The novel reassortant H7N9 virus was confirmed by molecular methods to have originated in poultry, with the mutations occurring during the spread of the H7N9 virus infection. Live poultry markets played an important role in whole H7N9 circulation.
See Also:
Latest articles in those days:
- Intranasal influenza virus-vectored vaccine offers protection against clade 2.3.4.4b H5N1 infection in small animal models 10 hours ago
- Mapping of stakeholders in avian influenza surveillance in Canada 22 hours ago
- [preprint]Population Immunity to Hemagglutinin Head, Stalk and Neuraminidase of Highly Pathogenic Avian Influenza 2.3.4.4b A(H5N1) viruses in the United States and the Impact of Seasonal Influenza on 1 days ago
- Airborne Influenza Virus Surveillance Platform Using Paper-Based Immunosensors and a Growth-Based Virus Aerosol Concentrator 1 days ago
- [preprint]A Human H5N1 Influenza Virus Expressing Bioluminescence for Evaluating Viral Infection and Identifying Therapeutic Interventions 2 days ago
[Go Top] [Close Window]