Dysregulated T-Helper Type 1 (Th1):Th2 Cytokine Profile and Poor Immune Response in Pregnant Ferrets Infected With 2009 Pandemic Influenza A(H1N1) Virus

J Infect Dis. 2018 Jan 17;217(3):438-442. doi: 10.1093/infdis/jix328.

Abstract

Pregnancy has been associated with severe influenza, an association highlighted during the 2009 pandemic of influenza A(H1N1) virus (A[H1N1]pdm09) infection. To assess the underlying mechanism, we infected pregnant and non-pregnant ferrets with A(H1N1) pdm09 virus. A(H1N1)pdm09-infected pregnant ferrets also had higher levels of inflammatory cytokines in their pulmonary tracts. Systemically, total CD8+ T cell counts and A(H1N1)pdm09-specific B-cell responses in blood were significantly lower in pregnant ferrets. This model predicts that the poorer outcome for pregnant women during the A(H1N1)pdm09 pandemic was due to an elevated level of viral replication and to a cytokine imbalance that led to a less effective immune response.

Keywords: Pregnancy; immune response; pandemic influenza A virus.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • B-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / immunology
  • Cytokines / metabolism*
  • Disease Models, Animal
  • Female
  • Ferrets
  • Influenza A Virus, H1N1 Subtype / immunology*
  • Lung / pathology
  • Lung / virology
  • Orthomyxoviridae Infections / pathology*
  • Orthomyxoviridae Infections / virology
  • Pregnancy
  • Pregnancy Complications, Infectious / pathology*
  • Pregnancy Complications, Infectious / virology
  • Th1 Cells / immunology*
  • Th2 Cells / immunology*

Substances

  • Cytokines