97,000 french volunteers help map COVID-19's hidden spread
NCT ID NCT04392388
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This completed study enrolled nearly 97,000 adults from long-running French health studies to track how many people had been infected with the coronavirus. Participants provided blood samples and answered questionnaires. The goal was to measure infection rates and understand what factors influenced who got sick, without testing any treatment.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- What this could lead to
- If successful, this study could help public health officials better understand how COVID-19 spread in the community and how long antibodies last.
- What could go wrong
- This is an observational study, not a treatment trial. It cannot test any drug or vaccine, and results may not apply to other countries or later variants.
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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.
Contacts and locations
Locations
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Inserm
Paris, France
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