Monoclonal antibody-mediated neutralization of SARS-CoV-2 in an IRF9-deficient child

Proc Natl Acad Sci U S A. 2021 Nov 9;118(45):e2114390118. doi: 10.1073/pnas.2114390118.

Abstract

We describe an unvaccinated child at risk for life-threatening COVID-19 due to an inherited deficiency of IRF9, which governs ISGF-3-dependent responses to type I and III interferons (IFN). She was admitted, with a high nasal SARS-CoV-2 load on day 1 of upper respiratory tract infection. She was viremic on day 2 and received casirivimab and imdevimab. Her clinical manifestations and viremia disappeared on days 3 and 4, respectively. Circulating SARS-CoV-2 virus induced the expression of IFN-stimulated genes in leukocytes on day 1, whereas the secretion of blood type I IFNs, which peaked on day 4, did not. Antibody-mediated SARS-CoV-2 neutralization is, therefore, sufficient to overcome a deficiency of antiviral IFNs.

Keywords: COVID-19; RNA-seq; SARS-CoV-2; inherited primary immunodeficiency; interferon.

Publication types

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

MeSH terms

  • Antibodies, Monoclonal, Humanized / therapeutic use*
  • Antibodies, Neutralizing / therapeutic use
  • COVID-19 / therapy*
  • Child, Preschool
  • Female
  • Humans
  • Immunocompromised Host
  • Interferon-Stimulated Gene Factor 3, gamma Subunit / deficiency*
  • Interferon-Stimulated Gene Factor 3, gamma Subunit / genetics*
  • Mutation
  • SARS-CoV-2 / immunology*
  • Viral Load

Substances

  • Antibodies, Monoclonal, Humanized
  • Antibodies, Neutralizing
  • IRF9 protein, human
  • Interferon-Stimulated Gene Factor 3, gamma Subunit
  • imdevimab
  • casirivimab