Plain-English translation of NCT04320732 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
This is a research study designed to identify the real-life factors that make it more or less likely for someone to catch COVID-19. Researchers will ask people—including those who have had COVID-19, those who haven't, healthcare workers, and people in high-risk settings—to answer questions about their daily lives, work, and activities using an online form on their smartphone. By comparing answers from people who got COVID-19 with those who didn't, researchers hope to discover which situations and behaviors put people at highest risk.
During the pandemic, it was difficult and risky for researchers to study COVID-19 patients directly in hospitals because of infection danger and limited protective equipment. This study uses a safer approach—online questionnaires—to gather real-world information about how and where people catch COVID-19, so governments can create smarter public health rules that actually protect communities.
You likely qualify if…
You likely don't qualify if…
You would fill out an online questionnaire on your smartphone about your daily activities, workplace, and any COVID-19 symptoms or diagnosis. Depending on your group (people with COVID-19, healthcare workers, or healthy volunteers), you may be asked to answer questions one time or multiple times over weeks or months. Some participants may also be asked to provide a biological sample like a saliva or blood sample if they are willing, though this is optional.
AI-generated summary from trial data · Jun 9, 2026 · Not medical advice
Norway
Sponsor
Oslo University Hospital
Collaborators
Age Labs AS
Enrollment target
~250,000 participants
Started
March 2020
Primary completion
March 2025
This trial's estimated completion date has passed — the record may not be fully up to date.
Age range
18 Years and older
Last updated on clinicaltrials.gov in December 2021.
Reach out to the team running this trial. Response times vary — some teams are faster than others.
Central contact
Arne Søraas, MD, PhD
Oslo University 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.