Plain-English translation of NCT04327570 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
Researchers at KU Leuven University Hospital want to understand exactly how your immune system responds when you have COVID-19—especially why some people get very sick while others have milder illness. This study will collect blood samples, throat and rectal swabs, and sometimes fluid from deep in the lungs to compare the immune responses between patients in intensive care and those in regular hospital wards.
During the COVID-19 pandemic, doctors noticed that some patients became severely ill while others recovered more easily. By studying the immune response in detail, researchers hope to understand what causes severe disease and potentially help doctors predict who is at highest risk and how to treat them better.
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If you are already hospitalized with COVID-19, researchers will collect blood samples, throat and rectal swabs, and possibly other samples like fluid from your lungs—depending on what is safe for your condition. You'll be compared with other patients who have milder or more severe disease to help scientists understand the differences in immune response. The study is observational, meaning you won't receive any experimental treatment; researchers are simply studying your body's natural response to the infection.
AI-generated summary from trial data · Jun 3, 2026 · Not medical advice
Belgium
Enrollment target
~100 participants
Started
March 2020
Primary completion
March 2028
Age range
18 Years and older
Last updated on clinicaltrials.gov in April 2026.
Reach out to the team running this trial. Response times vary — some teams are faster than others.
Central contact
Joost Wauters, MD PhD
UZ Leuven
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.