NCT06401720

Age Related Differences in Respiratory Immune Responses in Influenza Virus Infection

Respiratory Immune Responses in Human Influenza Virus Infection Across Age to Understand What Dictates Disease Severity

• Status: Enrolling By Invitation
• Phase: —
• Study type: Observational
• Enrollment: 800 (estimated)
• Sponsor: Karolinska Institutet · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

Summary

The goal of this observational study is to understand immune responses to viral airway infection in adults, including the elderly. The main question(s) to answer is/are: Why do some individuals acquire only asymptomatic or mild Influenza A virus (IAV) infection while others become severely ill and even succumb to the same disease? Participants will be asked to donate samples when seeking health care for influenza-like symptoms or if hospitalized for IAV or SARS-CoV-2. Samples asked for are: * Blood sample by venepuncture * Blood sample by capillary sampling * Nasopharyngeal aspirate * Nasopharyngeal swab * Endotracheal tube aspirate * Nasal swab * Nasal curette * Breath Explor (sampling of expired air) Researchers will compare obtained results with the same type of samples from healthy controls.

Detailed description

This observational study will specifically investigate different immunological parameters in blood and at the site of infection in patients with IAV symptoms or confirmed infection to understand parameters related to disease course. Blood and airway samples will be analyzed for immune cell subsets and their functionality, antibodies and other soluble mediators and linked to clinical data. Immune cells will be analyzed using multi-color flow cytometry, RNA sequencing, and in vitro functionality assays. Fluids (plasma, serum, supernatants from airway samples and cell culture supernatants) will be analyzed using ELISA (and or similar methods), proximity extension assay (Olink), etc.

Conditions

• Influenza A Infection
• Influenza B Virus Infection
• SARS CoV 2 Infection
• RSV Infection

Timeline

• Start date: 2024-01-01
• Primary completion: 2028-12-31
• Completion: 2030-12-31
• First posted: 2024-05-07
• Last updated: 2024-05-07

Locations

5 sites across 1 country: Sweden