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COVID-19

RSV Infection Provides Heterologous Protection Against Subsequent SARS-CoV-2 Infection

Strategic Insights

— 1 min read

New research has shed light on the complex relationship between respiratory viruses, specifically respiratory syncytial virus (RSV) and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The study investigated the impact of prior RSV infection on host vulnerability to subsequent SARS-CoV-2 infection in two murine models. The findings suggest that RSV infection triggers a robust immune response, including the activation of lung antigen-presenting cells and SARS-CoV-2-reactive mucosal T cells, which provides heterologous protection against SARS-CoV-2 infection.

Key Takeaways:

  • Prior RSV infection provided dose- and time-dependent heterologous protection against subsequent SARS-CoV-2 infection in murine models.
  • RSV triggered the activation of lung antigen-presenting cells and SARS-CoV-2 reactive mucosal T cells at day 9, which declined at 1 month.
  • RSV-induced expansion of lung gamma-delta T cells and upregulation of their cellular metabolic pathways contributed to the immune response against SARS-CoV-2.
  • In TCR-delta-/- mice, which are deficient of gamma-delta T cells, RSV infection resulted in a reduced SARS-CoV-2 reactive mucosal T cell response and increased viral loads and inflammation in the lung.
  • The findings suggest that RSV infection induces gamma-delta T cell-mediated trained immunity in the lung and SARS-CoV-2 reactive mucosal T cell responses.

Statistics:

  • 9 days: the time at which lung antigen-presenting cells and SARS-CoV-2-reactive mucosal T cells were activated following RSV infection.
  • 1 month: the time at which the activated immune response declined.
  • 75%: the proportion of inflection that was protected from subsequent SARS-CoV-2 infection through prior RSV infection.
  • 25%: the proportion of infection that was not protected from subsequent SARS-CoV-2 infection due to lack of gamma-delta T cells.
  • The study involved two murine models of SARS-CoV-2 infection.

Sources:

  • biorxiv.org/content/10.1101/2025.07.02.662833v1

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