An Experimental Medicine Multicenter Trial to Evaluate the Safety and Immunogenicity of Experimental Versus Authorized SARS-CoV-2 Vaccine Candidates as a Booster Dose in Healthy Participants Previously Vaccinated With Authorized mRNA SARS-CoV-2 Vaccines.

The SOLVE-01 trial is a study evaluating four SARS-CoV-2 vaccines as booster injections: two experimental vaccines (CD40.RBDv and CD40.Pan.CoV, both combined with the Hiltonol® adjuvant) and two authorised vaccines (Comirnaty® and NuvaxovidTM). This trial is designed for healthy adults aged 18 to 65 at the time of signing the informed consent form. The main objectives of this trial are: * to evaluate the safety of the two experimental vaccines, * to determine the antibody response induced by the vaccines and its durability. Participants will: * Receive one injection of vaccine and two intradermal skin tests * Come to the hospital 10 visits for medical exams and blood and saliva sample collection * Keep a diary of their symptoms and the treatments taken

NCT Number	NCT07605520
Lead Sponsor	ANRS, Emerging Infectious Diseases
Conditions	Healthy Adults
Enrollment	48 participants
Start Date	2026-05-13
Primary Completion	2028-05 (estimated)
Study Completion	2028-12 (estimated)
Updated on ClinicalTrials.gov	2026-06-02