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- What: The FDA approved Arexvy, a respiratory syncytial virus (RSV) vaccine, for adults aged 60 years and older.
- When: Approved May 3, 2023, with data published September 25, 2025, in the New england Journal of Medicine.
- Why it Matters: RSV causes notable illness and hospitalization in older adults, and this is the first widely available vaccine to prevent it.
RSV Vaccine Approved for Older Adults: A breakthrough in respiratory Protection
Understanding RSV and Why It’s a Threat to Seniors
Respiratory Syncytial Virus (RSV) is a common respiratory virus that usually causes mild, cold-like symptoms. However, for older adults, RSV can lead to severe illness, including pneumonia and hospitalization. Before the development of a vaccine, RSV was estimated to cause approximately 60,000-160,000 hospitalizations and 6,000-10,000 deaths annually among adults 65 years and older in the United States. The virus weakens the respiratory system, making individuals more vulnerable to secondary infections.
The impact of RSV is frequently enough underestimated. Symptoms can mimic influenza or COVID-19, leading to delayed diagnosis and treatment. This is particularly concerning for those with underlying health conditions like heart failure or chronic obstructive pulmonary disease (COPD).
The Arexvy vaccine: How it effectively works and Trial Results
Arexvy, developed by GSK, is a recombinant subunit vaccine containing a stabilized prefusion F protein. This protein is found on the surface of the RSV virus and is crucial for the virus to enter cells. By presenting this protein to the immune system, the vaccine triggers the production of antibodies that can neutralize the virus and prevent infection.
The pivotal Phase 3 trial, published in the New England Journal of Medicine on September 25, 2025, involved over 12,600 adults aged 60 years and older.The results demonstrated a vaccine efficacy of 82.6% against RSV-associated lower respiratory tract disease (LRTD) – defined as having at least two symptoms, such as cough, shortness of breath, or wheezing. The vaccine also showed efficacy against severe LRTD, with a 94.1% reduction in cases requiring hospitalization.
| Outcome | Vaccine Group (Arexvy) | Placebo Group | Vaccine Efficacy (%) |
|---|---|---|---|
| RSV-Associated LRTD | 1.4% | 7.9% | 82.6 |
| Severe RSV-Associated LRTD (Hospitalization) | 0.4% | 0.7% | 94.1 |
Safety data from the trial indicated that Arexvy was generally well-tolerated. The most common side effects were pain at the injection site, fatigue, muscle aches, and headache. Serious adverse events were rare and not significantly different between the vaccine and placebo groups.
Who Should Get the RSV Vaccine?
The FDA approved Arexvy for adults aged 60 years and older to prevent RSV-associated LRTD. The Centers for Disease Control and prevention (CDC) Advisory committee on Immunization Practices (ACIP) will provide further recommendations on who should *routinely* receive the vaccine. Currently, the CDC recommends a shared clinical decision-making approach, meaning individuals should discuss the benefits and risks with their healthcare provider.
Factors to consider when deciding whether to get vaccinated include age, underlying health conditions, lifestyle, and risk of exposure to RSV. Individuals with weakened immune systems or chronic