Protection From Influenza: Determining the Impact of Prior Infection
Aperçu de l'étude
Statut
Statut
Les conditions
Les conditions
Intervention / Traitement
Intervention / Traitement
Description détaillée
Significance: This study will provide critical information on the best technique in vaccine candidate testing and improve influenza treatment approaches. The long-term goal of this research is to identify the T-cell responses that are surrogates (biomarkers) of serious complications of influenza in older adults and predict vaccine efficacy (prevention of influenza illness) and vaccine effectiveness (prevention of serious complications). Further, translating new insights into age-related immune dysfunction to the design of new influenza vaccines is critical to addressing this unmet need in the population aged 65 and older.
Innovation: The study will help in the validation of clinical tools and biomarkers as prognostic indicators of influenza illness severity in vaccinated older adults, point-of-care diagnostics that would direct other preventive strategies to reduce the impact of influenza illness in vaccinated older adults, and correlates of protection to evaluate the potential of new influenza vaccines to enhance protection against the serious complications of influenza illness. The investigators have established that GrzB activity and the IFNg: IL-10 ratio in influenza-stimulated PBMC correlate with protection against influenza, and preliminary data to show that low GrzB activity in influenza-stimulated PBMC correlates with more severe disease and higher levels of frailty. The innovations of this project are the established methods for developing correlates of protection, the clinical insights into how frailty affects immune-mediated protection against influenza, and the direct translation of this research to provide a reasonable method for primary care clinicians to estimate vaccine effectiveness in an individual older person. These results will translate to the practical design of clinical trials to evaluate the potential for new influenza vaccines to better protect against the serious complications of influenza and complement those based on antibody titers and/or clinical outcomes alone.
Type d'étude
Type d'étude
Inscription (Anticipé)
Inscription
Contacts et emplacements
Coordonnées de l'étude
Coordonnées de l'étude
- Nom: Amanda Axler, BSc.
- Numéro de téléphone: 1924 7055237300
- E-mail: aaxler@hsnri.ca
Lieux d'étude
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Ontario
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Sudbury, Ontario, Canada, P3E 5J1
- Recrutement
- Health Sciences North Research Institute
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Contact:
- Amanda l Axler, BSc
- Numéro de téléphone: 1924 705-523-7300
- E-mail: aaxler@amric.ca
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Contact:
- Beth Gentleman, BSc
- Numéro de téléphone: 2631 705-523-7300
- E-mail: bgentleman@amric.ca
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Chercheur principal:
- Janet E McElhaney, MD
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Critères de participation
Critère d'éligibilité
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
Méthode d'échantillonnage
Population étudiée
La description
Inclusion Criteria:
- Written informed consent provided by the participant.
Age 65 years of age or older admitted to Health Sciences North with at least one the following:
- Laboratory confirmed influenza illness
- Acute exacerbation of chronic obstructive pulmonary disease (AECOPD).
- Any respiratory or influenza-like symptoms (dyspnea, cough, sore throat, myalgia, arthralgia, fever, delirium/altered level of consciousness) that a test for influenza was negative.
- Willing to receive influenza vaccination in the subsequent flu season
Exclusion Criteria:
- Patients whose reason for hospital admission was unrelated to influenza or (for example patients admitted due to trauma, elective surgery, or patients who have an alternative diagnosis that is clearly not respiratory).
- Chest x-ray positive for pneumonia.
- Study participants who cannot be vaccinated due to previous severe reaction to influenza vaccine, egg, latex, or thimerosol allergies, or refusal of vaccination.
- Immunosuppressive disorders or medications (including oral prednisone in doses >10 mg daily).
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
Nombre de groupes / cohortes
Cohortes et interventions
Groupe / CohorteGroupe / Cohorte |
Intervention / TraitementIntervention / Traitement |
|---|---|
|
Case
older adult patients (over the age of 65) admitted to Health Sciences North with laboratory confirmed influenza illness (LCII)
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Control
matched control subjects (non-LCII)
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Que mesure l'étude ?
Principaux critères de jugement
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
High expression of CTL associated cytokines and granzymes in PBMC's are predictors of influenza infection severity.
Délai: 2 years
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PBMCs from adults hospitalized for laboratory confirmed influenza illness (LCII) will be collected at admission and 30 days post hospitalization.
These samples will be matched with hospitalized non-LCII adult controls.
T-cells will be isolated from whole blood samples and gene expression of IFNg, IL10 and GrzB will be measured and compared between time points and subjects.
These levels do not have a separate unit of measure.
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2 years
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Mesures de résultats secondaires
Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Vaccination in previously infected individuals increases the protection provided by subsequent vaccination and will be higher than those receiving vaccination alone (with no previous infection)
Délai: 2 years
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Older adults hospitalized for influenza illness the previous season will be compared to matched, hospitalized older adults with influenza-like illness (non-LCII).
PBMCs will be collected from each group, before receiving influenza vaccination and 4 weeks after vaccination.
PBMCs will be challenged ex vivo with influenza virus and gene expression of CTL related genes will be measured and compared between each group.
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2 years
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Collaborateurs et enquêteurs
Parrainer
Parrainer
Collaborateurs
Collaborateurs
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude
Début de l'étude
Achèvement primaire (Anticipé)
Achèvement primaire
Achèvement de l'étude (Anticipé)
Achèvement de l'étude
Dates d'inscription aux études
Première soumission
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première soumission répondant aux critères de contrôle qualité
Première publication (Estimation)
Première publication
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour publiée
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
Autres numéros d'identification d'étude
- Protection from Influenza
Plan pour les données individuelles des participants (IPD)
Prévoyez-vous de partager les données individuelles des participants (DPI) ?
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