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Respiratory viruses and eosinophils: exploring the connections

Helene F Rosenberg1, Kimberly D Dyer, Joseph B Domachowske

  • 1Eosinophil Biology Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. hrosenberg@niaid.nih.gov

Antiviral Research
|April 21, 2009
PubMed

Insights

Eosinophilic leukocytes play an unclear role in respiratory syncytial virus (RSV) infection, potentially impacting disease severity and virus clearance. Further research is needed to clarify their exact function in antiviral defense.

Area of Science:

  • Immunology
  • Virology
  • Pulmonology

Background:

  • Respiratory syncytial virus (RSV) is a major pediatric pathogen with no available vaccine.
  • A historical RSV vaccine trial showed immunopathology, with eosinophils recruited to the lungs.
  • The precise role of eosinophils in RSV infection remains incompletely understood.

Purpose of the Study:

  • To review the role of eosinophilic leukocytes in the pathogenesis and pathophysiology of respiratory virus infections.
  • To examine the involvement of eosinophils in response to RSV infection and vaccination.
  • To explore eosinophils' contribution to viral clearance and host defense.

Main Methods:

  • Review of existing literature on eosinophils and respiratory virus infections, with a focus on RSV.
  • Analysis of experimental models (mice, cotton rats) and human infant data.
  • Consideration of studies investigating eosinophils in vaccine-induced immunopathology and primary infection.

Main Results:

  • Eosinophils are recruited to the lungs in response to RSV antigens, particularly in infants and experimental models.
  • The contribution of eosinophils to severe disease following RSV infection or vaccination is unclear.
  • The role of eosinophils in viral clearance and host defense is still under investigation.

Conclusions:

  • The exact role of virus-elicited eosinophils in respiratory syncytial virus infection (whether beneficial, detrimental, or neutral) requires further clarification.
  • Understanding eosinophil involvement is crucial for developing effective RSV vaccines and treatments.
  • Emerging research suggests eosinophils may even be targets of viral infection.

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