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Scientists probe hidden immune cells behind hepatitis b vaccine protection

NCT ID NCT06876467

Knowledge-focused Sponsor: Assistance Publique - Hôpitaux de Paris Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This study looks at how the hepatitis B vaccine triggers T cells, a key part of the immune system. Researchers will test blood from 115 healthy adults 5 to 10 weeks after vaccination to see if they have T cells that recognize the hepatitis B virus. The goal is to understand why some people maintain protection longer and how to improve vaccines.

What this could mean

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

Active substance
hepatitis B vaccine
What this could lead to
If successful, this study could help improve hepatitis B vaccines by revealing how T cells contribute to long-lasting protection.
What could go wrong
This is an observational study, not a treatment trial. It only measures immune responses in a small group of healthy adults, so results may not apply broadly.

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

Study facts

What this study's own registry entry says, in plain language.

Participants

About 115 people

The number the study aims to enrol. It can still change while the study runs.

Started

Aug 2025

Expected to finish

Dec 2028

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Healthy individuals receiving HBV vaccination

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adults ≥18 years * Pre-vaccination HBV serology carried out within 4 weeks prior to vaccination * Collection of no objection Exclusion Criteria: * Opposition of the person or inability to give opposition * Pregnant or breast-feeding women * Chronic illnesses affecting the individual's immune system (asplenia; hyposplenia; haematological cancer; auto-immune disease requiring immunosuppressive treatment, HIV infection). * Non-affiliation with a social security scheme, Universal Medical Coverage or any equivalent scheme

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Conditions

The condition(s) this trial relates to.

hepatitis B virus infection prevention target

As listed by the trial registrant

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

Hepatitis B vaccination Immune response ΓΔ T cells

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Hôpital Saint Louis AP-HP

    RECRUITING

    Paris, France

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