Plain-English translation of NCT06784739 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
The COMMUNITY study is tracking how your body's immune system responds to COVID-19 over several years. Researchers will collect blood samples, saliva, and nasal secretions from you every four months to measure your antibodies and immune cells. The study also monitors whether you catch COVID-19, flu, or other respiratory viruses to understand what protects you from getting sick.
Scientists still have important questions about how long COVID-19 immunity lasts and what makes some people more protected against reinfection than others. This research will help doctors better understand who is truly protected and guide future vaccine strategies.
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You will visit the study team every four months for about 2–3 years. At each visit, they will collect a small blood sample, saliva, and a nasal swab. You'll also use a smartphone app to answer questions about your health, work, vaccinations, and any infections you've had. Some participants may do extra home-based testing to catch infections early. All your samples are stored safely for future research.
AI-generated summary from trial data · Jun 18, 2026 · Not medical advice
Sweden
Enrollment target
~5,500 participants
Started
April 2020
Primary completion
April 2027
Age range
18 Years and older
Last updated on clinicaltrials.gov in January 2025.
Reach out to the team running this trial. Response times vary — some teams are faster than others.
Central contact
Nina Greilert Norin, RN
Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital
Tell us you're interested and we'll help connect you with the research team. We'll walk you through what to expect first — no email needed to get started.