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Study to Assess Safety and Immunogenicity of an Egg-based H5N8 Influenza Vaccine at Multiple Dose Levels Adjuvanted With Matrix-M in Healthy Participants 18 Years of Age and Above.

11 de setembro de 2026 atualizado por: Sanofi

A Phase 1/2, Parallel, Observer-blind Study to Assess the Safety and Immunogenicity of an Egg-based H5N8 Influenza Vaccine at Multiple Dose Levels Adjuvanted With Matrix-M in Healthy Participants 18 Years of Age and Above.

The study aims to evaluate an egg-based H5N8 influenza vaccine up to 3 dose levels (low, medium, and high dose) given with or without adjuvant to see if the adjuvant improves vaccine effectiveness.

The study will enroll healthy adults aged 18 years and over. Participants will receive 2 injections in their arm of either one of the 3 dose levels of the study vaccine (low, medium, or high dose) with the adjuvant or the unadjuvanted vaccine (high dose).

Study duration per participant: approximately 14 months (including screening visit).

Visão geral do estudo

Status

Recrutamento

Condições

Intervenção / Tratamento

Tipo de estudo

Intervencional

Inscrição (Estimado)

640

Estágio

  • Fase 2
  • Fase 1

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

  • Nome: Trial Transparency email recommended (Toll free for US & Canada)
  • Número de telefone: option 6 800-633-1610
  • E-mail: contact-us@sanofi.com

Locais de estudo

    • Arizona
      • Tempe, Arizona, Estados Unidos, 85281
        • Recrutamento
        • AMR Clinical Phoenix, Arizona- Site Number : 8400004
    • California
      • Rolling Hills Estates, California, Estados Unidos, 90274
        • Recrutamento
        • Peninsula Research Associates- Site Number : 8400011
      • San Diego, California, Estados Unidos, 92123
        • Recrutamento
        • California Research Foundation- Site Number : 8400007
    • Florida
      • Coral Gables, Florida, Estados Unidos, 33134
        • Recrutamento
        • Alliance for Multispeciality Research - Coral Gables- Site Number : 8400003
      • DeLand, Florida, Estados Unidos, 32720
        • Recrutamento
        • Accel Research Sites Network - DeLand Clinical Research Unit- Site Number : 8400017
      • Fort Myers, Florida, Estados Unidos, 33912
        • Recrutamento
        • Alliance for Multispeciality Research - Fort Myers- Site Number : 8400001
      • Miami Lakes, Florida, Estados Unidos, 33016
        • Recrutamento
        • Indago Research & Health Center- Site Number : 8400010
    • Georgia
      • Decatur, Georgia, Estados Unidos, 30030
        • Recrutamento
        • Accel Research Sites - NeuroStudies- Site Number : 8400014
      • Decatur, Georgia, Estados Unidos, 30030
        • Recrutamento
        • iResearch Atlanta- Site Number : 8400008
    • Illinois
      • Oak Brook, Illinois, Estados Unidos, 60523
        • Recrutamento
        • AMR Chicago- Site Number : 8400005
    • Kansas
      • Newton, Kansas, Estados Unidos, 67114
        • Recrutamento
        • AMR Clinical Newton, Kansas- Site Number : 8400006
    • New York
      • Rochester, New York, Estados Unidos, 14609
        • Recrutamento
        • Rochester Clinical Research- Site Number : 8400012
    • South Carolina
      • North Charleston, South Carolina, Estados Unidos, 29405
        • Recrutamento
        • Coastal Carolina Research Center - North Charleston- Site Number : 8400018
    • Tennessee
      • Knoxville, Tennessee, Estados Unidos, 37909
        • Recrutamento
        • Alliance for Multispecialty Research - Weisgarber Medical Park- Site Number : 8400002
    • Utah
      • Salt Lake City, Utah, Estados Unidos, 84107
        • Recrutamento
        • CenExel JRB - Salth Lake City- Site Number : 8400009
    • Virginia
      • Charlottesville, Virginia, Estados Unidos, 22911
        • Recrutamento
        • Charlottesville Medical Research- Site Number : 8400016

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

  • Adulto
  • Adulto mais velho

Aceita Voluntários Saudáveis

Sim

Descrição

Inclusion Criteria:

  • Aged 18 years or above on the day of inclusion
  • Participants who are healthy as determined by medical evaluation including medical history
  • Not pregnant/breastfeeding; non-childbearing potential or uses effective contraception/abstinence from ≥4 weeks before the first study intervention dose to ≥8 weeks after the last dose
  • Informed consent form has been signed and dated
  • Able to attend all scheduled visits and to comply with all study procedures
  • Covered by health insurance, if required by local regulations

Exclusion Criteria:

  • Known or suspected immunodeficiency; immunosuppressive therapy in past 6 months; or long-term systemic corticosteroid (eg, prednisone for more than 2 weeks in the past 3 months)
  • Known hepatitis B or hepatitis C infection (based on medical history)
  • Known personal or family history of previous episodes of Guillan-Barré syndrome (GBS), neuritis (including Bell's palsy), convulsions, encephalitis, transverse myelitis, and vasculitis
  • Known systemic hypersensitivity to any of the study intervention components or history of life-threatening reaction to the study interventions or products with same substances
  • Self-reported thrombocytopenia contraindicating intramuscular (IM) injection based on investigator's judgment
  • Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion, contraindicating IM injection based on investigator's judgment
  • Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with study conduct or completion
  • History of A/H5 infection prior to the study participation
  • Moderate or severe acute illness/infection (per investigator judgment)/fever (≥ 38.0°C [≥ 100.4°F]) on study intervention day. Include participant only after the condition or fever has resolved
  • Alcohol, prescription drug, or substance abuse that, in the opinion of the investigator, might interfere with the study conduct or completion
  • Any vaccine given 4 weeks before first study intervention or any planned vaccination to be given prior to Day 43 (ie, approximately 21 days after the second study intervention)
  • Previous vaccination against A(H5) with an investigational or marketed vaccine. This includes, but is not limited to, influenza subtypes A(H5N1), A(H5N8), and A(H5N6)
  • Has received a blood transfusion or blood-derived products, including immunoglobulins in the past 3 months
  • Participation in another clinical study for a vaccine, drug, medical device, or medical procedure within 4 weeks before enrollment or planned participation during the present study period
  • Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily
  • Is an investigator, investigator/study center employee, or immediate family member (parent, spouse, natural/adopted child) of the investigator/employee with direct involvement in the study
  • Any screening safety laboratory parameters out of normal ranges and assessed as > Grade 2

The above information is not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Prevenção
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Dobro

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Experimental: Group 1: Flu H5 egg pandemic low dose vaccine, with adjuvant
Participants receive 2 intramuscular injections of flu H5 egg pandemic low dose vaccine, with adjuvant
Pharmaceutical form: Suspension for injection Route of administration: Intramuscular (IM)
Experimental: Group 2: Flu H5 Egg Pandemic medium dose vaccine, with adjuvant
Participants receive 2 intramuscular injections of flu H5 egg pandemic medium dose vaccine, with adjuvant
Pharmaceutical form: Suspension for injection Route of administration: Intramuscular (IM)
Experimental: Group 3: Flu H5 Egg Pandemic high dose vaccine, with adjuvant
Participants receive 2 intramuscular injections of flu H5 egg pandemic high dose vaccine, with adjuvant
Pharmaceutical form: Suspension for injection Route of administration: Intramuscular (IM)
Experimental: Group 4: Flu H5 Egg Pandemic high dose vaccine, without adjuvant
Participants receive 2 intramuscular injections of flu H5 egg pandemic high dose vaccine, without adjuvant
Pharmaceutical form: Suspension for injection Route of administration: Intramuscular (IM)

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Number of participants with immediate Adverse Events (AEs)
Prazo: Within 30 minutes after each vaccination
Immediate adverse events are medically relevant unsolicited systemic adverse events reported in the 30 minutes after vaccination
Within 30 minutes after each vaccination
Number of participants experiencing solicited administration site reactions (pre-listed in the participant diary and case report form [CRF])
Prazo: Within 8 days of each vaccination, including the day of vaccination
A solicited reaction is an adverse reaction (sign or symptom) observed and reported under the conditions pre-listed (for example: injection site pain or headache). Solicited administration site reactions are reactions at and around the injection/administration site
Within 8 days of each vaccination, including the day of vaccination
Number of participants experiencing solicited systemic reactions (pre-listed in the participant diary and CRF)
Prazo: Within 8 days of each vaccination, including the day of vaccination
All solicited reactions that are not solicited injection or administration site reactions
Within 8 days of each vaccination, including the day of vaccination
Number of participants experiencing unsolicited AEs
Prazo: Within 21 days after the first vaccination, including the day of the first vaccination, and within 28 days after the second vaccination, including the day of the second vaccination
Unsolicited AE: an observed AE that does not fulfill the conditions of solicited reactions
Within 21 days after the first vaccination, including the day of the first vaccination, and within 28 days after the second vaccination, including the day of the second vaccination
Number of participants experiencing Medically Attended Adverse Events (MAAEs)
Prazo: From Day 01 until the end of the study, approximately 14 months
MAAEs are collected throughout the study
From Day 01 until the end of the study, approximately 14 months
Number of participants experiencing Adverse Events of Special Interest (AESIs)
Prazo: From Day 01 until the end of the study, approximately 14 months
AESIs are collected throughout the study
From Day 01 until the end of the study, approximately 14 months
Number of participants experiencing Serious Adverse Events (SAEs)
Prazo: From Day 01 until the end of the study, approximately 14 months
SAEs are collected throughout the study
From Day 01 until the end of the study, approximately 14 months
Number of participants experiencing out-of-range biological test results (including shift from baseline values)
Prazo: Up to 8 days after each vaccination
Safety laboratory assessments will include clinical chemistry and hematology
Up to 8 days after each vaccination
Number of participants experiencing AEs leading to discontinuation
Prazo: From Day 01 until the end of the study, approximately 14 months
AEs leading to discontinuation are collected throughout the study
From Day 01 until the end of the study, approximately 14 months
Geometric mean titer of hemagglutination inhibition (HAI) assay antibody (Ab) titer
Prazo: Day 01 and Day 43
Influenza vaccine antibody titers are measured by HAI assay
Day 01 and Day 43
Number of participants with HAI Ab titer ≥ 40 (1 dilution [dil]; ie, seroprotection)
Prazo: Day 43
Influenza vaccine antibody titers are measured by HAI assay
Day 43
Number of participants with seroconversion
Prazo: Day 01 and Day 43
Seroconversion is defined as HAI Ab titer < 10 (1/dil) on Day 01 and post-injection titer ≥ 40 (1/dil) on Day 43; or defined as HAI Ab titer ≥ 10 (1/dil) on Day 01 and a ≥ 4-fold increase in titer (1/dil) on Day 43
Day 01 and Day 43
Geometric mean titer ratio of individual HAI Ab titer ratio Day 43/Day 01
Prazo: Day 01 and Day 43
Influenza vaccine antibody titers are measured by HAI assay
Day 01 and Day 43

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Geometric mean titer of hemagglutination inhibition (HAI) assay antibody (Ab) titer obtained on Day 01, Day 22, Day 43, Day 202
Prazo: Day 01, Day 22, Day 43, Day 202
Influenza vaccine antibody titers are measured by HAI assay
Day 01, Day 22, Day 43, Day 202
Geometric mean titer ratio of individual HAI Ab titer ratios Day 22/Day 01, Day 43/Day 01, Day 202/Day 43
Prazo: Day 01, Day 22, Day 43, Day 202
Individual HAI Ab titer ratios are calculated for the following time points: Day 22/Day 01, Day 43/Day 01 and Day 202/Day 43
Day 01, Day 22, Day 43, Day 202
Number of participants with individual HAI Ab titer ≥ 40 (1/dil) on Day 01, Day 22, Day 43, Day 202
Prazo: Day 01, Day 22, Day 43, Day 202
Influenza vaccine antibody titers are measured by HAI assay
Day 01, Day 22, Day 43, Day 202
Number of participants with seroconversion on Day 22 compared to Day 01 (baseline)
Prazo: Day 01, Day 22
Seroconversion is defined as titer < 10 (1/dil) on Day 01 and post-injection titer ≥ 40 (1/dil) on Day 22; or defined as titer ≥ 10 (1/dil) on Day 01 and a ≥ 4 fold increase in titer (1/dil) on Day 22
Day 01, Day 22
Number of participants with detectable HAI Ab titer
Prazo: Day 01, Day 22, Day 43, Day 202
Detectable HAI Ab titer: a titer ≥ 10 (1/dil)
Day 01, Day 22, Day 43, Day 202
Geometric mean titer of neutralization (NT) Ab titer
Prazo: Day 01, Day 22, Day 43, Day 202
Influenza vaccine antibody titers are measured by serum neutralization (SN) assay
Day 01, Day 22, Day 43, Day 202
Geometric mean titer ratio of individual NT Ab titer ratio
Prazo: Day 01, Day 22, Day 43, Day 202
Individual NT Ab titer ratios are calculated for the following time points: Day 22/Day 01, Day 43/Day 01 and Day 202/Day 43
Day 01, Day 22, Day 43, Day 202
Number of participants with NT Ab titer ≥ 20 (1/dil)
Prazo: Day 01, Day 43, Day 202
NT Ab titer ≥ 20 (1/dil) on Day 43; compared to Day 01 and Day 202
Day 01, Day 43, Day 202
Number of participants with NT Ab titer ≥ 40 (1/dil)
Prazo: Day 01, Day 43, Day 202
NT Ab titer ≥ 40 (1/dil) on Day 43; compared to Day 01 and Day 202
Day 01, Day 43, Day 202
Number of participants with NT Ab titer ≥ 80 (1/dil)
Prazo: Day 01, Day 43, Day 202
NT Ab titer ≥ 80 (1/dil) on Day 43; compared to Day 01 and Day 202
Day 01, Day 43, Day 202
Geometric mean fold-rise of fold increase in NT Ab titer [post/pre] ≥ 2 and ≥ 4
Prazo: Day 43
Influenza vaccine antibody titers are measured by serum neutralization (SN) assay
Day 43
Number of participants with detectable NT Ab titer
Prazo: Day 01, Day 22, Day 43, Day 202
Detectable NT Ab titer: a titer ≥ 10 (1/dil) on Day 01, Day 22, Day 43, Day 202
Day 01, Day 22, Day 43, Day 202

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

3 de agosto de 2026

Conclusão Primária (Estimado)

22 de fevereiro de 2028

Conclusão do estudo (Estimado)

22 de fevereiro de 2028

Datas de inscrição no estudo

Enviado pela primeira vez

31 de julho de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

19 de agosto de 2026

Primeira postagem (Real)

21 de agosto de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

15 de setembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

11 de setembro de 2026

Última verificação

1 de setembro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • VBX21138
  • U1111-1325-2670 (Identificador de registro: ICTRP)

Plano para dados de participantes individuais (IPD)

Planeja compartilhar dados de participantes individuais (IPD)?

SIM

Descrição do plano IPD

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Sim

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .