Figure 1From: Efficacy and safety of a booster dose of influenza vaccination in solid organ transplant recipients, TRANSGRIPE 1-2: study protocol for a multicenter, randomized, controlled clinical trial TRANSGRIPE 1-2 trial design and procedures. Clinical trial visits are structured in five (or six) time points: initial screening baseline evaluation and administration of the first dose of vaccine in arms A and B (visit 1 and 2), administration in arm B of second dose of vaccine 5 weeks after inclusion (visit 3), short-term follow-up 10 weeks after inclusion (visit 4) and 15 weeks after inclusion (visit 5), as well as long-term follow-up 12 months after the first dose of vaccine (visit 6). Immunogenicity and drug safety were assessed at each programmed time point.Back to article page