2016
DOI: 10.1128/jvi.00134-16
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Mammalian Pathogenesis and Transmission of H7N9 Influenza Viruses from Three Waves, 2013-2015

Abstract: Three waves of human infection with H7N9 influenza viruses have concluded to date, but only viruses within the first wave (iso-lated IMPORTANCE H7N9 influenza viruses, first isolated in 2013, continue to cause human infection and represent an ongoing public health threat.Now entering the fourth wave of human infection, H7N9 viruses continue to exhibit genetic diversity in avian hosts, necessitating continuous efforts to monitor their pandemic potential. However, viruses isolated post-2013 have not been extensi… Show more

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Cited by 22 publications
(23 citation statements)
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“…Using selected human and AIV controls, we established that our assay yielded results consistent with previously reported pH of fusion (Figure 2). 19, 37, 38, 39 All avian H5 and H7 viruses had relatively high pH of fusion (between pH 5.7 and 6.0), while the pandemic isolates A/California/7/2009(H1N1) and A/Aichi/2/68(H3N2) exhibited lower pH of fusion between pH 5.2 and 5.5, typical of human adapted influenza viruses. 19 The H9N2 viruses examined in this study had pH of fusion that ranged between 5.41 and 5.84.…”
Section: Resultsmentioning
confidence: 99%
“…Using selected human and AIV controls, we established that our assay yielded results consistent with previously reported pH of fusion (Figure 2). 19, 37, 38, 39 All avian H5 and H7 viruses had relatively high pH of fusion (between pH 5.7 and 6.0), while the pandemic isolates A/California/7/2009(H1N1) and A/Aichi/2/68(H3N2) exhibited lower pH of fusion between pH 5.2 and 5.5, typical of human adapted influenza viruses. 19 The H9N2 viruses examined in this study had pH of fusion that ranged between 5.41 and 5.84.…”
Section: Resultsmentioning
confidence: 99%
“…32 Although HPAI viruses are more often associated with enhanced virulence in ferrets compared with LPAI viruses, intravenous pathogenicity index tests in chickens are not predictive of mammalian virulence. Similarly, virulence determinations in other small mammal models may not always be predictive of virulence in ferrets; viruses that cause moderate disease in ferrets may cause lethality in mice at comparable inoculum doses, 33 whereas the guinea pig model does not recapitulate the high virulence phenotype of H5N1 viruses or the reconstructed 1918 H1N1 virus. 34…”
Section: Scope Of Influenza Viruses Evaluated In Ferretsmentioning
confidence: 99%
“…To evaluate H7N9 virus replication in epithelial cells, the primary site for replication in mammals, we inoculated cells of the immortalized human airway epithelial cell line Calu-3 with a low dose for evaluation of multicycle replication kinetics. Compared to precursor avian H7 and H9 viruses, LPAI H7N9 viruses have demonstrated an enhanced ability to replicate in human airway epithelial Calu-3 cells, suggestive of mammalian host adaptation (26). The recent amino acid changes associated with select fifth-wave H7N9 viruses prompted us to compare their growth kinetics in this cell type.…”
Section: Resultsmentioning
confidence: 99%
“…Ferrets have been extensively employed to evaluate the pandemic potential of newly emerged influenza A viruses (28). The LPAI H7N9 viruses from previous waves were able to cause moderate weight loss and replicate efficiently in both the upper and lower respiratory tracts of ferrets (12,26). To evaluate the virulence of fifth-wave H7N9 viruses, we i.n.…”
Section: Resultsmentioning
confidence: 99%