Receptor specificity does not affect replication or virulence of the 2009 pandemic H1N1 influenza virus in mice and ferrets

Virology. 2013 Nov;446(1-2):349-56. doi: 10.1016/j.virol.2013.08.011. Epub 2013 Sep 10.


Human influenza viruses predominantly bind α2,6 linked sialic acid (SA) while avian viruses bind α2,3 SA-containing complex glycans. Virulence and tissue tropism of influenza viruses have been ascribed to this binding preference. We generated 2009 pandemic H1N1 (pH1N1) viruses with either predominant α2,3 or α2,6 SA binding and evaluated these viruses in mice and ferrets. The α2,3 pH1N1 virus had similar virulence in mice and replicated to similar titers in the respiratory tract of mice and ferrets as the α2,6 and WT pH1N1 viruses. Immunohistochemical analysis determined that all viruses infected similar cell types in ferret lungs. There is increasing evidence that receptor specificity of influenza viruses is more complex than the binary model of α2,6 and α2,3 SA binding and our data suggest that influenza viruses use a wide range of SA moieties to infect host cells.

Keywords: Influenza virus; Receptor specificity; Replication; Tissue tropism; Virulence.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Disease Models, Animal
  • Female
  • Ferrets
  • Host-Pathogen Interactions*
  • Immunohistochemistry
  • Influenza A Virus, H1N1 Subtype / pathogenicity*
  • Influenza A Virus, H1N1 Subtype / physiology*
  • Lung / pathology
  • Lung / virology
  • Mice
  • Mice, Inbred BALB C
  • Orthomyxoviridae Infections / pathology
  • Orthomyxoviridae Infections / virology
  • Receptors, Virus / metabolism*
  • Sialic Acids / metabolism*
  • Viral Load
  • Viral Tropism*
  • Virulence
  • Virus Replication*


  • Receptors, Virus
  • Sialic Acids