One-Stop shot? flu and COVID boosters combined safe in seniors, study finds
NCT ID NCT04969276
First seen Nov 01, 2025 · Last updated Jun 22, 2026 · Updated 32 times
Summary
This study looked at whether it is safe and effective to give a high-dose flu vaccine and a Moderna COVID-19 booster at the same time to adults aged 65 and older. 306 participants who had already received two doses of the Moderna vaccine were enrolled. Researchers measured side effects and antibody levels to see if giving both shots together worked as well as giving them separately.
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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Investigational Site Number :8400001
Peoria, Illinois, 61614, United States
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Investigational Site Number :8400002
Austin, Texas, 78705, United States
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Investigational Site Number :8400003
Glendale, Arizona, 85306, United States
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Investigational Site Number :8400004
Vista, California, 92083, United States
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Investigational Site Number :8400005
Centennial, Colorado, 80112, United States
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Investigational Site Number :8400006
San Diego, California, 92108, United States
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Fluzone High-Dose Quadrivalent influenza vaccine and Moderna COVID-19 vaccine (mRNA-1273)
What this could lead to
If successful, this could show that getting a flu shot and a COVID-19 booster at the same time is safe and effective for older adults, simplifying vaccination schedules.
What could go wrong
This is a phase 2 study with only 306 participants, so results may not apply to everyone. It focuses on safety and immune response, not on preventing actual illness.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.