NCT04992195 · RECRUITING
Impact of COVID-19 Vaccines on Cerebrovascular Health
This observational study is tracking whether COVID-19 vaccines have any measurable effect on brain and vascular health over time. Participants get blood tests and cognitive screening before and after vaccination. There is no experimental drug — researchers are watching what happens naturally in a vaccinated population. The phase is unspecified, which fits an observational design: this is data-gathering, not a drug or device being tested for approval.
Eligibility criteria
Inclusion Criteria: All consecutive citizens in the CUHK Brain Health Longitudinal Study cohort who received baseline MRI brain. Exclusion Criteria: 1. Citizens with clinically evident stroke or dementia prior to recruitment; or 2. Citizens who are unable to provide an informed consent; or 3. Citizen with contraindications to MRI brain, e.g., non-MRI compatible implants, claustrophobia, etc; or 4. Citizens who had no baseline MRI brain assessment.
The sponsor's own eligibility wording, lightly reformatted. The study team makes the final eligibility decision — worth discussing with your doctor.
Eligibility criteria as of 2026-02-24