Scientists hunt for long COVID fingerprints in the brain and blood
NCT ID NCT06528171
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks for specific signs of long COVID in the brain and blood. Researchers will compare people with and without long COVID symptoms using brain scans and blood tests. The goal is to find objective markers that could help doctors diagnose long COVID more reliably.
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 could lead to a diagnostic test for long COVID, helping doctors identify and monitor the condition more accurately.
- What could go wrong
- This is an observational study, not a treatment trial. It may not find clear biomarkers, and results may not apply to all long COVID patients.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 200 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Dec 2024
- Expected to finish
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Jun 2028
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
FOR CL+ PATIENTS Inclusion Criteria: * Case definition in line with WHO Delphi process Exclusion Criteria: * History of chronic fatigue syndrome diagnosed before or after Covid. * History of progressive psychiatric pathology. * History of acute Covid requiring admission to intensive care and mechanical ventilation. * No social security affiliation. FOR CONTROL (CL-) Inclusion Criteria: * History of acute COVID-19, mild, moderate or severe (episode at least 3 months at the time of inclusion). * Absence of persistent symptoms more than 3 months after first Covid symptoms (or mild not affecting daily activities). Exclusion Criteria: * History of progressive psychiatric pathology. * History of acute Covid requiring admission to intensive care and mechanical ventilation. * No social security affiliation. * Pregnant or breast-feeding.
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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.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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CHU de NICE
RECRUITINGNice, 06200, France
More trials for these conditions
Other studies related to the condition(s) this trial covers.
- Mindfulness may offer relief for long COVID sufferers
- Can magnetic pulses to the brain reverse Long-COVID smell loss, tinnitus, and fatigue?
- Brain fog after COVID: can a mental workout restore focus?
- Fish oil and Body's own healing molecules could lift long COVID depression
- Zapping the brain to clear long COVID fog: a new hope?
- Can tailored exercise help tame racing heart and fatigue after COVID?