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Not yet recruiting NCT07592429

Assessment of Immune Memory - Humoral and Cellular - in mPOX-infected Patients : an Ancillary Study of the ANRS0258s MOSAIC Cohort

No phase Interventional Mpox (Monkeypox)

For patients and families

In plain language

An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.

What is being studied
The protocol lists: blood sampling.
Who it may be relevant to
Registry conditions: Mpox (Monkeypox). Basic parameters: from 18 years · All.
What needs checking
Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
Where it takes place
Center list to be confirmed — check the primary protocol.
Next step
Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →

Unsure about the terms? Read our patient guide →

Overview

Primary objective The overall objective is to assess the long-term amplitude and durability of the immune responses after mpox virus (MPXV) infection. Primary endpoint The main outcomes are: the presence of neutralizing antibodies in the serum and the presence of detectable mpox virus-specific memory B cells. Neutralizing antibodies titers will be measured with a semi-automated cell-based assay using live mpox virus. Memory B cells will be measured by flow cytometry and other techniques. Secondary objectives 1. Assess the amplitude and the stability of the MPXV antigen-specific B-cell memory response after infection, against the immunodominant antigens A27, A33, B5, L1, D8, and H3. 2. Assess the breadth of the B-cell repertoire and its neutralizing capacity in a subset of patients 3. Assess the humoral immunity using different serological techniques, for the detection and quantification of anti-MPXV antibodies, and assess the seroneutralization capacities of each antibody. Secondary endpoints 1. The presence of MPXV antigen-specific B-cell memory. Memory B cells will be measured by flow cytometry and other techniques. 2. The breadth and neutralizing capacity of the B-cell repertoire in a subset of patients. 3. The humoral immunity using serological techniques.

Detailed description

Single inclusion visit with data collection and blood sample. No further follow-up of participants.

A total of 60 participants previously enrolled in the main cohort ANRS 0758s MOSAIC are planned to be included, distributed among France (n = 35), Italy (n = 20), and Switzerland (n = 5).

Interventions

  • Procedure blood sampling
    Procedure: Patients included in the ANRS0758s MOSAIC cohort will be recalled \>3 years after their infection to come to hospital to have a review of medical history since mpox infection, a clinical examination in case of symptoms suggestive of a mpox infection and samples taken for the study.

Primary outcome measures

  • The main outcomes are: the presence of neutralizing antibodies in the serum and the presence of detectable mpox virus-specific memory B cells. [Time frame: Baseline (Day 1)]

Eligibility criteria

Inclusion criteria

  • Written informed consent, signed by the participant and the investigator prior to any study-related procedure
  • Person previously enrolled in the ANR0258s-MOSAIC cohort (see Appendix 19.2 for MOSAIC inclusion criteria) between July 2022 and July 2023
  • Person with a blood sample taken within 8 months following mpox infection
  • ≥ 18 years old

Exclusion criteria

  • Individuals who, in the investigator's opinion, are unlikely to comply with study procedures or whose medical condition is incompatible with study participation
  • For France only: person not affiliated to or not benefiting from a social security scheme in accordance with article L1121-11 of the French Public Health Code (Aide Médicale d'Etat \[AME\] does not constitute a social security scheme)
  • Pregnant or breastfeeding women
  • Individuals under guardianship or curatorship, or deprived of liberty by judicial or administrative decision

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation
N/A
Model
Single group
Masking
Open label
Primary purpose
Health services research

Study locations

Center list to be confirmed — check the primary protocol.

Identifiers

NCT: NCT07592429 · ANRS0791s POXAIM

Primary sources (government registries)

View this study on ClinicalTrials.gov ↗