How long does COVID immunity last? new study follows patients for a year
NCT ID NCT04637867
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This completed study looked at 189 adults who had COVID-19 to see how long their immune system remembers the virus. Researchers collected blood, saliva, and nose swabs at 6 and 12 months after infection to measure antibody levels. The goal was to understand if protective immunity lasts and how strong it is over time.
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 clarify how long natural immunity lasts after a COVID-19 infection.
What could go wrong
This is an observational study with no treatment, so it cannot directly lead to a cure or therapy. Results may not apply to new variants.
Disclaimer
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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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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
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Locations
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Service épidémiologie, Hopital édouard Herriot
Lyon, Rhone, 69003, France
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hopital Edouard Herriot
Lyon, 69003, France