Plain-English translation of NCT04611243 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
This research study is tracking two groups of people over three years: adults who recovered from COVID-19 and people who received COVID vaccines. Researchers want to understand how lungs heal after COVID-19, how well different vaccines protect people, and whether a booster dose helps people who didn't develop strong immunity after their first two doses.
Long-term effects of COVID-19 on the lungs are still not fully understood, and doctors want to learn which vaccines work best and whether some people need additional booster doses to build stronger protection.
You likely qualify if…
You likely don't qualify if…
If you're a COVID survivor, you'll visit the clinic at 6, 12, 24, and 36 months after you leave the hospital for breathing tests, a walking test, chest X-rays or CT scans, and blood draws. If you're in the vaccine groups, researchers will collect blood samples before your vaccine and then at regular intervals up to 36 months afterward. Some participants with lower immune response after two vaccine doses will be invited to receive a booster shot (either the same vaccine or a different one) and continue with additional blood tests.
AI-generated summary from trial data · Jun 6, 2026 · Not medical advice
Hong Kong
Collaborators
The University of Hong Kong, Health and Medical Research Fund
Enrollment target
~700 participants
Started
May 2020
Primary completion
August 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 August 2024.
Reach out to the team running this trial. Response times vary — some teams are faster than others.
Central contact
Susanna Ng, MBChB
Chinese University of Hong Kong
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.