Is the respiratory syncytial virus (RSV) vaccine an inactivated vaccine?

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Last updated: October 5, 2026 • View editorial policy

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RSV vaccine type

No—currently licensed RSV vaccines are not “inactivated virus” vaccines; they are prefusion F protein–based protein subunit vaccines (Arexvy, Abrysvo) and an mRNA vaccine (mResvia). 1

  • Evidence and framing

    • ACIP 2024–2025 guidance specifies: Moderna mResvia is an mRNA vaccine encoding prefusion RSV F; GSK Arexvy and Pfizer Abrysvo are protein subunit vaccines targeting prefusion F. None are whole‑virus inactivated products 1.
    • Historical note: past formalin‑inactivated RSV vaccines caused enhanced respiratory disease in RSV‑naive children, influencing current non–inactivated platforms; this supports safety choices that affect morbidity/mortality/QOL today 2.

  • Pitfalls to avoid

    • Do not conflate current RSV vaccines with “inactivated” vaccines; that term historically referred to whole‑virus inactivated candidates linked to adverse outcomes in the 1960s 2.
    • If patients ask about “live” vaccines: these adult RSV vaccines are not live; they are protein subunit or mRNA per ACIP 1.

References

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