Global study tracks how COVID-19 variants outsmart vaccines

NCT ID NCT05534009

Recruiting now Knowledge-focused Sponsor: Euresist Network GEIE Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 26, 2026 · Updated 2 times

Summary

This study follows 1800 healthcare workers from eight countries for up to 24 months to see how their immune systems respond to COVID-19 vaccines and infections. Researchers will collect blood samples and health data to understand how different viral variants affect immunity. The goal is to improve future vaccine strategies, not to test a new treatment.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

What this could lead to: If successful, this study could help scientists understand how well vaccines and past infections protect against new COVID-19 variants.
What could go wrong: This is an observational study, not a treatment trial, so it won't directly lead to a new therapy. Results may take time and might not apply to all populations.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

COVID-19

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

COVID-19

Contacts and locations

Locations

Azienda Socio-Sanitaria Territoriale Santi Paolo e Carlo
RECRUITING

Milan, Italy
Bach Mai Hospital
RECRUITING

Hanoi, Vietnam
Centro Hospitalar de Lisboa Ocidental
RECRUITING

Lisbon, Portugal
Heinrich Heine university
RECRUITING

Düsseldorf, Germany
Hospital Juan Ghaham Casasus
RECRUITING

Villahermosa, Mexico
Ieo Istituto Europeo Di Oncologia
RECRUITING

Milan, Italy
Viesoji Istaiga Vilniaus Uiversiteto Ligoninė Santaros klinikos
RECRUITING

Vilnius, Lithuania

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