Long COVID mystery: study follows mild cases for a year

NCT ID NCT04813731

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

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.

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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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