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:
2025-12-25 @ 4:19 AM
Ignite Modification Date:
2025-12-25 @ 4:19 AM
NCT ID:
NCT05951920
Brief Summary:
In order to investigate whether a germinal center response occurs following vaccine boost and to characterize it based on the type of vaccine received, we aim to analyze Spike and/or RBD-specific germinal center B cells within the draining lymph nodes.
To achieve this, we will perform lymph node fine needle aspiration of the draining lymph node in 6 subjects in each study arm, 3 to 6 weeks after the booster vaccine injection.
Detailed Description:
Lymph nodes are secondary lymphoid organs essential for the establishment of the germinal center reaction, allowing the generation of long-lived B cell memory and high-affinity antibodies. In order to investigate whether a germinal center response occurs following vaccine boost and to characterize it based on the type of vaccine received, we aim to analyze Spike and/or RBD-specific germinal center B cells within the draining lymph nodes. Accessing germinal center through fine needle aspirations under ultrasound guidance has recently emerged as an innovative strategy in the United States to investigate vaccine response. This procedure under local anesthesia is well-tolerated, and no major side effects have been reported in a hundred patients who underwent fine needle aspiration. The technical details for performing this examination are now well-described.
Our previous work has highlighted the importance of repertoire diversity in responding to new variants of SARS-CoV-2. We thus aim to investigate whether a booster dose with mRNA or protein-based vaccine mobilizes memory B cells or naive cells, thereby contributing to a greater diversity of the Memory B cell comportment. To preserve the diversity of the memory B cell pool is absolutely essential for our immune system to adapt against variants.
To achieve this, we will perform lymph node fine needle aspiration of the draining lymph node in 6 subjects in each study arm, 3 to 6 weeks after the booster vaccine injection. Indeed, it has been shown that the response of germinal centers in response to a booster vaccination was detectable at 2- and 8-weeks post-injection vaccination.
This outpatient procedure will be performed by a radiologist under ultrasound guidance, aiming to collect 4 fine needle aspirations from 4 axillary draining lymph nodes under local anesthesia. Concurrently, a 35 mL blood sample will be collected from the subject to correlate the response in secondary lymphoid organs with the circulating response.
Study:
NCT05951920
Study Brief:
Protocol Section:
NCT05951920