Description Module
The Description Module contains narrative descriptions of the clinical trial, including a brief summary and detailed description. These descriptions provide important information about the study's purpose, methodology, and key details in language accessible to both researchers and the general public.
Description Module path is as follows:
Study -> Protocol Section -> Description Module
Description Module
Ignite Creation Date:
2025-12-24 @ 4:18 PM
Ignite Modification Date:
2025-12-24 @ 4:18 PM
NCT ID:
NCT05037266
Brief Summary:
In response to the COVID-19 pandemic, several vaccines (Pfizer, Moderna, Astrazeneca, Janssen) have been developed and are being administered to millions of people in France and billions around the world through massive vaccination programs.
The Janssen vaccine is the fourth COVID-19 vaccine to be licensed in Europe. It received a European marketing authorization for all adults, without age limit, on March 11, 2021. Janssen's vaccine is a viral non replicating vector (adenovirus) vaccine targeting the Spike protein of the SARS-CoV-2 virus. It differs from currently available vaccines in that it is a single-dose regimen with significant protection at 28 days post-injection. Monitoring of the durability of the immune response is essential to assess the need for a booster vaccination. Insufficient data are available in the adult population regarding the evolution of the immune response. This point seems to be even more important in the elderly. Indeed, their immune system declines with age, leading to a greater susceptibility to infectious diseases and a weaker response to vaccination. This is called immunosenescence. Vaccination in this population is essential to avoid severe COVID-19 cases, since older people are particularly at risk.
Two CoviCompare studies with two licensed vaccines messenger RNA vaccines (Pfizer, Moderna) are underway to evaluate the immune response to each vaccine according to age.
We propose to conduct a study to evaluate the immunogenicity of the Janssen vaccine in different age groups with long-term follow-up. This will allow determining the need of a booster.
A common battery of in vitro and ex vivo immuno-monitoring tests has been set up to systematically assess the acquisition of humoral and cellular immunity over time over a period of 24 months following vaccination in the CoviCompare project. This trial, part of the CoviCompare project will use the same immunomonitoring set. This will also allow comparison of the immune response to different vaccines in subjects of different age in order to determine in this at risk population the better vaccination schedules.
The only difference between this trial and the other 2 trials of the CoviCompare project is that adults aged 18-45 will not be concerned here, because the adenovirus vaccine is not recommended for this age group in France
Detailed Description:
In this trial of the Covicompare project, we will therefore evaluate the immune response after Janssen vaccine in subjects aged more than 65 years and 55 to 65 years without a prior COVID-19, following the same immunomonitoring analyses as for the other CoviCompare project trials.
Study:
NCT05037266
Study Brief:
Protocol Section:
NCT05037266