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Long COVID mystery: study follows mild cases for a year

NCT ID NCT04813731

Knowledge-focused Sponsor: Katarina Hedin Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 26, 2026 · Updated 1 time

Summary

This completed study followed 300 adults who had mild to moderate COVID-19 but were not hospitalized. Researchers tracked their symptoms for up to a year to see how long it took to fully recover and how lingering symptoms affected daily life. The goal was to better understand long COVID in primary care patients.

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 doctors better predict and manage long COVID in patients who had mild or moderate infections.
What could go wrong
This is an observational study, not a treatment trial. It cannot prove what causes lingering symptoms or how to fix them.

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.

Participants

300 people

The number who actually took part.

Started

Dec 2020

Finished

Jun 2022

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Adult patients over all age categories with laboratory confirmed SARS-CoV-2 infection and symptoms consistent with COVID-19

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show 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.

Inclusion Criteria: * Confirmed SARS-CoV-2 infection, either by polymeras chain reaction (PCR), or by antigen testing (if authorized/recommended/used by national/local governments) * Symptoms consistent with mild to moderate COVID-19 * Maximum of 2 weeks since positive SARS-CoV-2 test * Aged 18 years and older * Patient able and willing to comply with monthly phone calls. Exclusion Criteria: * Hospitalisation due to COVID-19

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Conditions

The condition(s) this trial relates to.

COVID-19 Signs and Symptoms

As listed by the trial registrant

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

COVID19 Symptoms and signs

Contacts and locations

Locations

  • Balan Medfam SRL

    Cluj-Napoca, Romania

  • Center for General Practice at Aalborg University

    Aalborg, Denmark

  • Centre for General Practice, Department of Family Medicine & Population Health (FAMPOP), Faculty of Medicine and Health Sciences, University of Antwerp

    Antwerp, Belgium

  • Covid-19 primary care special unit Sassuolo, Azienda Unità Sanitaria locale di Modena, Modena, Italy

    Modena, Italy

  • Département de Santé Publique, Université Côte d'Azur, Centre Hospitalier Universitaire de Nice, Nice, France

    Nice, France

  • Institut für Allgemeinmedizin Universitätsklinikum Würzburg Josef-Schneider-Str. 2/D7 97080 Würzburg

    Würzburg, Germany

  • Julius Center, University Medical Center Utrecht

    Utrecht, Netherlands

  • Kärna Primary Health Care Centre

    Linköping, Sweden

  • Medical University of Lodz, Lodz

    Lodz, Poland

  • R. Lugar Center for Public Health Research

    Tbilisi, Georgia

  • School of Medicine, National University of Ireland

    Galway, Ireland

  • Wetterhälsan Primary Health Care Centre

    Jönköping, Sweden

  • the Academic Centre for General Practice (ACHG), Department of Public Health and Primary Care, KU Leuven

    Leuven, Belgium

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Other studies related to the condition(s) this trial covers.