Do vaccines work as well in people with weak immune systems? new study investigates
NCT ID NCT04952766
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study looked at how well the Pfizer COVID-19 vaccine triggers an immune response in 196 adults with weakened immune systems (due to conditions like kidney transplant, cancer, or HIV) compared to healthy adults. Researchers measured antibody levels and their ability to neutralize the virus over six months. The goal was to understand if immunocompromised people get the same protection from the vaccine.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
BNT162b2 (Pfizer-BioNTech COVID-19 vaccine)
What this could lead to
If successful, this study could show how well the COVID-19 vaccine protects immunocompromised people, helping tailor vaccination strategies for them.
What could go wrong
This is a completed observational study, not a treatment trial. It measures immune response but does not test a new therapy, so it won't directly change care.
Disclaimer
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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CHU Orléans
Orléans, 45067, France