Blood samples from kids and seniors could shape next Year's flu vaccine

NCT ID NCT04551677

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 aged 65 and older who received the 2020-2021 flu vaccine. The samples were sent to experts at the WHO, CDC, and FDA to help decide which flu strains to include in future vaccines. The goal was not to test the vaccine itself, but to gather data to improve vaccine recommendations.

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, 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 lead to better 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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