Healthy Clinical Trial
Official title:
A Phase 2a Age Descending Study to Investigate the Safety and Immunogenicity of the SF2a-TT15 Synthetic Carbohydrate-based Conjugate Vaccine Against Shigella Flexneri 2a in Adults, Children, and Infant Target Population in Endemic Countries.
A study among adults, children and infants in Kenya to determine if a new type of glycoconjugate vaccine incorporating a synthetic carbohydrate component is safe and induces immunity against Shigella.
The purpose of this study is to examine the safety and immunogenicity of two doses of the parenteral synthetic carbohydrate-based conjugate vaccine against Shigella flexneri 2a (Shigella flexneri 2a-Tetanus Toxoid15 (SF2a-TT15)) adjuvanted or not with Alhydrogel in infants in an endemic country (Kenya), the target population for the vaccine, using an age-descending approach. In total, 232 participants will be enrolled in the study: 16 adults (18-50 years-old), 16 children (2-5 years-old) and 200 infants (9 months-old +/ 1 mo). The vaccine will be tested in adults first, then in children and eventually in infants in Kenya (where Shigella infection is present), based on the safety/tolerability in each group before to moving to the other. Participants will be randomly assigned to receive the study vaccine or a placebo control (same solution but without the vaccine component). The participants will have to go through all the trial procedures including the 14 visits (3 injections and 11 follow-up) during a 16 months period. ;
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