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Připravenost na pandemii vakcíny prostřednictvím imunologické charakterizace dýchacích cest (VAXXAIR)

4. listopadu 2026 aktualizováno: Copenhagen Respiratory Research

Hloubková imunologická analýza imunity dýchacích cest po nazální živé atenuované a intramuskulární vakcíně proti chřipce

The study aims to compare the effectiveness of live attenuated influenza vaccines (LAIV) and intramuscular-inactivated vaccines (IIV) in healthy individuals aged 18-49. It will investigate cellular and humoral responses, identify immunological markers for targeted vaccine improvement, and establish a collaborative platform for accelerated immunological and clinical vaccine research.

Přehled studie

Postavení

Aktivní, ne nábor

Podmínky

Intervence / Léčba

Detailní popis

There are several types of vaccines and the focus on the important role of vaccines in health has increased after the SARS-CoV-2 pandemic. Therefore, it is desired to investigate whether so-called 'live attenuated influenza vaccines' (LAIV) can prove more effective than the most frequently used 'intramuscular-inactivated vaccines' (IIV).

Several studies have previously compared the humoral and cellular response to LAIV and IIV and some of these have shown that LAIV elicits a more robust cellular response than intramuscularly administered vaccines.

In the study, the immunological differences in cellular and humoral response following vaccination either intramuscularly or nasally will be characterized. The patient group will consist of healthy individuals between 18-49 years of age. It is further desired to identify immunological markers that vaccines can be directed against in order to improve the immunological response. Finally, a platform for collaboration on accelerated immunological and clinical vaccine research will be established.

The study is a randomized, double-blind, placebo-controlled study. It is carried out in several locations and is Good Clinical Practice monitored.

Typ studie

Intervenční

Zápis (Odhadovaný)

60

Fáze

  • Raná fáze 1

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní místa

      • Copenhagen, Dánsko, 2300
        • National Influenza Center for WHO at Statens Serum Institut (SSI)
      • Kongens Lyngby, Dánsko, 2800
        • Technical University of Denmark (DTU)
    • Copenhagen
      • Copenhagen, Copenhagen, Dánsko, 2100
        • Copenhagen Hospital Biobank Unit, Department of Clinical Immunology, Rigshospitalet, Denmark
      • Copenhagen, Copenhagen, Dánsko, 2100
        • Diagnostic Immunology, Department of Clinical Immunology, Rigshospitalet, Denmark
      • Copenhagen, Copenhagen, Dánsko, 2100
        • Institute for Immunology and Microbiology (ISIM), Panum Institute, University of Copenhagen
      • Gentofte Municipality, Copenhagen, Dánsko, 2900
        • Department of Medicine, Section of Respiratory Medicine, Herlev and Gentofte Hospital
      • London, Spojené království, W12 0NN
        • Imperial College

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let až 49 let (Dospělý)

Přijímá zdravé dobrovolníky

Ano

Pohlaví způsobilá ke studiu

Všechno

Popis

Inclusion Criteria:

  1. Healthy individuals (Charlson´s co-morbidity index :0, and investigator judged as healthy)

  2. Age: 18-49 years

  3. Total IgG levels in normal range (discretion of investigator according to local lab)

  4. Total IgA levels (discretion of investigator according to local lab)

  5. Undetectable HAI titres to the H3N2 component of the vaccines*

  6. Normal CD4+ and CD8+ T-cell and normal B-cell counts

  7. Reference levels from ISO-15189 accredited T-, B- and NK-cell count routine analyses will be applied.

    • If <20% of the first 100 screened persons apply to this criterion, this will be changed to a specific cut off based on the lowest quartile level of HAI titres to the H3N2 component of these 100 screened persons.

Exclusion Criteria:

  1. Laboratory-confirmed influenza infection during the past year documented by a positive PCR test in the Danish Microbiological database or anamnestic reported influenza infection in the same period

  2. Active smoker

  3. BMI > 35 kg/m2

  4. Women of childbearing potential not using safe contraception, or who are pregnant, or breast-feeding

  5. Any allergies to components of or contraindication for Vaxigriptetra® or Flumist® incl. previous severe adverse reactions to influenza vaccinations or components of the vaccines

  6. Use of immunosuppressive drugs* within the past 6 months or who are currently using them

  7. HIV, HBV, HCV laboratory confirmed active infection at screening visit

  8. Have an acute illness, including an oral temperature ≥ 38°C, within 3 days prior to vaccination

  9. Have received any vaccines, including live-attenuated vaccines within 4 weeks before inclusion, or plan receipt of such vaccines within 30 days following the inclusion

  10. Any known malignant neoplasm within 5 years (except basal carcinoma of the skin).

  11. Severe mental illness or linguistic issues which significantly impedes cooperation

  12. Inability to provide written informed consent

    • defined as: Azathioprin, methotrexate, cyclophosphamide, basiliximab, belimumab, anifrolumab, alemtuzumab, rituximab, mycophenolat, calcineurin inhibitors (ciclosporin, voclosporin and tacrolimus), mTOR inhibitors (everolimus and sirolimus), prednisolone (or any corticosteroid in doses above the equivalent of 5 mg prednisolone), TNF-α inhibitors (such as infliximab), anti-thymocyte globulin.

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Primární účel: Prevence
  • Přidělení: Randomizované
  • Intervenční model: Paralelní přiřazení
  • Maskování: Čtyřnásobek

Zbraně a zásahy

Skupina účastníků / Arm
Intervence / Léčba
Experimentální: Vaxigripetra

This arm will receive 1 dose of 0.5 mL Vaxigripetra (intra-muscular injection) and 1 dose of 0.2 mL placebo (nasal, 1 spray in each nostril).

Tetravalent intramuscular vaccine. Mechanism of action: The vaccine induces an immune reaction involving antibody production.

Experimentální: Flumist

1 dose of 0.2 mL Flumist (nasal, 1 spray in each nostril) and 1 dose of 0.5 mL placebo (intra-muscular injection).

Tetravalent live attenuated influenza vaccine administered as a nasal spray. Mechanism of action: Not fully understood according to the prescribing information, but may involve influenza-specific T-cells and antibodies (serum and mucosal).

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Day 28, mucosal immunity in nasopharynx (humoral)
Časové okno: Day -14 (baseline) [+/-5 days] vs. day +28 [+/-5 days]

Time point: Comparison between day -14 (baseline) [+/-5 days] vs. day +28 [+/-5 days].

Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2) haemagglutinin vaccine-specific IgA in nasopharyngeal secretions will be characterized as outcome 1. All other individuals will be characterized as outcome 0.

Material: Nasopharyngeal secretions Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2) haemagglutinin vaccine-specific IgA in nasal secretions will be characterized as outcome 1. All other individuals will be characterized as outcome 0.

Material: nasopharyngeal secretion.

Day -14 (baseline) [+/-5 days] vs. day +28 [+/-5 days]

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Day 7, mucosal immunity in nasopharynx (humoral)
Časové okno: Day -14 (baseline) [+/-5 days] vs. day +7 [+/-1 days]

Time point: Comparison between day -14 (baseline) [+/-5 days] vs. day +7 [+/-1 days].

Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2) haemagglutinin vaccine-specific IgA in nasopharyngeal secretions will be characterized as outcome 1. All other individuals will be characterized as outcome 0.

Material: Nasopharyngeal secretions Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2) haemagglutinin vaccine-specific IgA in nasopharyngeal secretions will be characterized as outcome 1. All other individuals will be characterized as outcome 0.

Material: Nasopharyngeal secretions Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2)) haemagglutinin vaccine-specific IgA in nasal secretions will be characterized as outcome 1. All other individuals will be characterized as outcome 0.

Material: nasopharyngeal secretion.

Day -14 (baseline) [+/-5 days] vs. day +7 [+/-1 days]
Day 28, mucosal immunity in Lower Airways (BALF) (humoral)
Časové okno: Day -14 (baseline) [+/-5 days] vs. day +28 [+/-5 days]

Time point: Comparison between day -14 (baseline) [+/-5 days] vs. day +28 [+/-5 days].

Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2) haemagglutinin vaccine-specific IgA in nasopharyngeal secretions will be characterized as outcome 1. All other will be characterized as outcome 0.

Day -14 (baseline) [+/-5 days] vs. day +28 [+/-5 days]
Day 7, mucosal immunity in Lower Airways (BALF) (humoral)
Časové okno: Day -14 (baseline) [+/-5 days] vs. day +7 [+/-1 days]

Time point: Comparison between day -14 (baseline) [+/-5 days] vs. day +7 [+/-1 days].

Explanation: all individuals who have a ≥-4-fold rise in (A (H3N2) haemagglutinin vaccine-specific IgA in BALF will be characterized as outcome 1. All other individuals will be characterized as outcome 0.

Day -14 (baseline) [+/-5 days] vs. day +7 [+/-1 days]
Rise in mucosal antibody titre (humoral)
Časové okno: Day +28 [+/- 5 days]

Hypothesis: Intranasally administered LAIV influenza vaccine will more often produce a ≥-4-fold rise in mucosal antibody titre against each of the remaining (non-H3N2) vaccine virus haemagglutinin antigens vaccine-specific antibody (IgG (when BALF) and IgA (when nasopharyngeal)) titres in respiratory secretions compared to intramuscular IIV tetravalent influenza vaccine.

Time points: Day -14 (baseline), and i) day 28 [+/-5 days] ii) and day 7 [+/-1 day] after vaccination.

Antigens: 1) A (H1N1) ; 2) B/Austria/1359417/2021 ; 3) B/Phuket/3073/2013 Material: BALF and nasopharyngeal secretion

Day +28 [+/- 5 days]
Lower airways mucosal immunity, CD4+ (cellular)
Časové okno: Day -14 (baseline) vs. day +7

Hypothesis: Intranasally administered LAIV influenza vaccine will lead to a higher number of Antigen activated* CD4+ T-lymphocytes in BALF measured at day -14 (baseline) vs. day +7 as compared to intramuscular IIV tetravalent influenza vaccine.

Explanation: Fractions of CD4+ T-lymphocytes, that are antigen activated against an antigen pool composed of the antigens in the two utilized vaccines, will be measured at day -14 (baseline) and day +7.

Fold changes will be compared between vaccine arms. Material: BALF.

* A (H1N1) - A (H3N2) • B/Austria/1359417/2021 • B/Phuket/3073/2013

Day -14 (baseline) vs. day +7
Systemic immunity (blood) (cellular)
Časové okno: Day -14 (baseline) vs. day +7

Hypothesis: Intranasally administered LAIV influenza vaccine will lead to a higher number of Antigen activated* CD4+ T-lymphocytes in blood measured at day -14 (baseline) vs. day +7 as compared to intramuscular IIV tetravalent influenza vaccine.

Explanation: Fractions of CD4+ T-lymphocytes, that are antigen activated against an antigen pool composed of the antigens in the two utilized vaccines, will be measured at day -14 (baseline) and day +7.

Fold changes will be compared between vaccine arms. Material: Blood

* A (H1N1) - A (H3N2) • B/Austria/1359417/2021 • B/Phuket/3073/2013

Day -14 (baseline) vs. day +7

Další výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Early changes in local immune profiles (cellular)
Časové okno: Day -14 (baseline) vs. day +7

Hypothesis and explanation: Airway-delivered LAIV vaccine (Flumist) will induce early antigen specific T- lymphocytes as well as resident memory T- and B-cells locally in the respiratory tract that is characterized by activated TRM and TFH in BALF and mediastinal lymph nodes, and with higher levels of CXCR3pos-B-cells and BRM in BALF and respiratory mucosal tissue and mediatinal lymph nodes compared to that of intramuscular delivered trivalent flu vaccine.

Material: BALF

Day -14 (baseline) vs. day +7
Upper airways lymph node (Tonsil) immunity (cellular)
Časové okno: Day -14 (baseline) vs. day +7

Hypothesis: Intranasally administered LAIV influenza vaccine will lead to a higher number of Antigen activated* CD4+ T-lymphocytes in lymphoid tissue from tonsils measured at day -14 (baseline) vs. day +7 as compared to intramuscular IIV tetravalent influenza vaccine.

Explanation: Fractions of CD4+ and CD8+ T-lymphocytes, that are antigen activated against an antigen pool composed of the antigens in the two utilized vaccines, will be compared between day -14 (baseline) and day +7.

Material: Lymphoid tissue from tonsils. Analysis of this hypothesis depends on feasibility (enough material)

* A (H1N1) - A (H3N2) • B/Austria/1359417/2021 • B/Phuket/3073/2013

Day -14 (baseline) vs. day +7
Lower airways mucosal immunity, CD8+ (cellular)
Časové okno: Day -14 (baseline) vs. day +7

Hypothesis: Intranasally administered LAIV influenza vaccine will lead to a higher number of Antigen activated* CD8+ T-lymphocytes in BALF measured at day -14 (baseline) vs. day +7 as compared to intramuscular IIV tetravalent influenza vaccine.

Explanation: Fractions of CD8+ T-lymphocytes, that are antigen activated against an antigen pool composed of the antigens in the two utilized vaccines, will be measured at day -14 (baseline) and day +7.

Fold changes will be compared between vaccine arms. Material: BALF.

* A (H1N1) - A (H3N2) • B/Austria/1359417/2021 • B/Phuket/3073/2013

Day -14 (baseline) vs. day +7
Further exploratory humoral characterization
Časové okno: Day -14 (baseline), day +7 day +28 [+/-5 days], day +90 and day 180 [+/-5 days]

Haemagglutinin antigens vaccine-specific antibody (IgG) titres in serum (HAI). This will be analysed in the following analyses:

A. Number of participants with ≥-4-fold rise in serum antibody titres against each vaccine virus* B. Categorical and scalar associations between vaccine virus shedding (measured at days +1, +3, and +7 post-vaccination) and cellular and humoral immune responses.

C. Proportion of study enrolled subjects achieving a HAI titre of ≥1:40 measured using antibody titre measured at -14 (baseline), day +7 day +28 [+/-5 days], day +90 and day 180 [+/-5 days] after vaccination.

* A (H1N1) - A (H3N2) • B/Austria/1359417/2021 • B/Phuket/3073/2013

Day -14 (baseline), day +7 day +28 [+/-5 days], day +90 and day 180 [+/-5 days]

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Spolupracovníci

Vyšetřovatelé

  • Vrchní vyšetřovatel: Jens-Ulrik Stæhr Jensen, MD, PhD, Chronic Obstructive Pulmonary Disease Trial Network, Denmark

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Aktuální)

19. května 2025

Primární dokončení (Odhadovaný)

31. října 2032

Dokončení studie (Odhadovaný)

31. října 2032

Termíny zápisu do studia

První předloženo

18. června 2023

První předloženo, které splnilo kritéria kontroly kvality

18. června 2023

První zveřejněno (Aktuální)

27. června 2023

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

6. listopadu 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

4. listopadu 2026

Naposledy ověřeno

1. března 2026

Více informací

Termíny související s touto studií

Další identifikační čísla studie

  • VAXXAIR

Plán pro data jednotlivých účastníků (IPD)

Plánujete sdílet data jednotlivých účastníků (IPD)?

NE

Popis plánu IPD

This has not yet been decided.

Informace o lécích a zařízeních, studijní dokumenty

Studuje lékový produkt regulovaný americkým FDA

Ne

Studuje produkt zařízení regulovaný americkým úřadem FDA

Ne

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .