Blood samples from flu shots could shape Tomorrow's vaccines

NCT ID NCT05050318

Completed Knowledge-focused Sponsor: Sanofi Pasteur, a Sanofi Company Source: ClinicalTrials.gov ↗

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This study collected blood samples from 90 healthy children (6 months to under 9 years) and adults 65 and older after they received their seasonal flu vaccines. The samples were sent to health authorities to help decide which flu strains to include in future vaccines. The study did not test the vaccines themselves but aimed to improve vaccine strain selection.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Fluzone Quadrivalent and Fluzone High-Dose Quadrivalent influenza vaccines
What this could lead to: If successful, the data could help health experts choose the right flu strains for future vaccines, potentially making them more effective.
What could go wrong: This is a small, completed sample-collection study, not a test of vaccine effectiveness. The results may not directly improve vaccines.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

influenza

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

HEALTHY VOLUNTEERS INFLUENZA IMMUNIZATION

Contacts and locations

Locations

Investigational Site Number :8400001

Bardstown, Kentucky, 40004, United States
Investigational Site Number :8400002

Salt Lake City, Utah, 84121, United States

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