Association of Increased Receptor-Binding Avidity of Influenza A(H9N2) Viruses with Escape from Antibody-Based Immunity and Enhanced Zoonotic Potential

Details

• Alternative Title:
  Emerg Infect Dis
• Personal Author:
  Sealy, Joshua E. ; Yaqub, Tahir ; Peacock, Thomas P. ; Chang, Pengxiang ; Ermetal, Burcu ; Clements, Anabel ; Sadeyen, Jean-Remy ; Mehboob, Arslan ; Shelton, Holly ; Bryant, Juliet E. ; Daniels, Rod S. ; McCauley, John W. ; Iqbal, Munir
• Description:
  We characterized 55 influenza A(H9N2) viruses isolated in Pakistan during 2014-2016 and found that the hemagglutinin gene is of the G1 lineage and that internal genes have differentiated into a variety of novel genotypes. Some isolates had up to 4-fold reduction in hemagglutination inhibition titers compared with older viruses. Viruses with hemagglutinin A180T/V substitutions conveyed this antigenic diversity and also caused up to 3,500-fold greater binding to avian-like and >20-fold greater binding to human-like sialic acid receptor analogs. This enhanced binding avidity led to reduced virus replication in primary and continuous cell culture. We confirmed that altered receptor-binding avidity of H9N2 viruses, including enhanced binding to human-like receptors, results in antigenic variation in avian influenza viruses. Consequently, current vaccine formulations might not induce adequate protective immunity in poultry, and emergence of isolates with marked avidity for human-like receptors increases the zoonotic risk.
• Subjects:
  Animals Antibodies, Viral Antibody Affinity Antigenic Variation Binding Sites Erythrocytes Hemagglutinin Glycoproteins, Influenza Virus Humans Influenza A Virus, H9N2 Subtype Influenza In Birds Neuraminidase Phylogeny Poultry Poultry Diseases Receptors, Cell Surface Research Zoonoses

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• Source:
  Emerg Infect Dis. 25(1):63-72
• Pubmed ID:
  30561311
• Pubmed Central ID:
  PMC6302589
• Document Type:
  Journal Article
• Funding:
  Wellcome Trust/United Kingdom ; BBS/E/I/00001025/Biotechnology and Biological Sciences Research Council/United Kingdom ; BBS/E/I/00001708/Biotechnology and Biological Sciences Research Council/United Kingdom ; BB/L018853/1/Biotechnology and Biological Sciences Research Council/United Kingdom ; BB/N503563/1/Biotechnology and Biological Sciences Research Council/United Kingdom ; BBS/E/I/0000198/Biotechnology and Biological Sciences Research Council/United Kingdom ; BBS/E/I/00007034/Biotechnology and Biological Sciences Research Council/United Kingdom ; BBS/E/I/00007035/Biotechnology and Biological Sciences Research Council/United Kingdom ; BBS/E/I/00007038/Biotechnology and Biological Sciences Research Council/United Kingdom ; BBS/E/I/00007039/Biotechnology and Biological Sciences Research Council/United Kingdom ; FC001030/Cancer Research UK/United Kingdom ; FC001030/Medical Research Council/United Kingdom ; FC001030/Wellcome Trust/United Kingdom
• Place as Subject:
  Pakistan
• Location:
  Asia
• Volume:
  25
• Issue:
  1
• Collection(s):
  Emerging Infectious Diseases
• Main Document Checksum:
  urn:sha256:c95f6b680f568bfed4922cdf72dee8fe89604164c225bb10aaf79727204dcc84
• Download URL:
  https://stacks.cdc.gov/view/cdc/80439/cdc_80439_DS1.pdf
• File Type:
  [PDF - 2.35 MB ]