A single-center, randomized, blinded, multi-cohort, placebo-controlled trial design was adopted.This trial adopts the seamless design of phase I/IIa, which is carried out in two phases, phase I and phase IIa, phase I is the age/dose climbing phase, and phase IIa is the dose expansion phase.It is planned to enroll 580 subjects, divided into 5 age groups, including: young adults (18-59 years old, 60 people), adolescents (6 -17 years old, 60 people), and elderly (≥60 years old, 160 people) , Toddlers (2-5 years old, 140), infants (6 weeks to 23 months old, 160).Research phase and trial grouping: age/dose climbing phase: 340 subjects are planned to be enrolled in Liuzhou City, and they will be enrolled in the group according to the age order of young adults → adolescents and old people → toddlers → infants and young children. There are 10 cohorts, randomly divided into experimental group (low-dose or high-dose), placebo group (containing aluminum), and the random ratio of each entry stage is 2:1. Among them, infants and the elderly will be added a placebo group without aluminum adjuvant, test group (low dose or high dose), placebo group (aluminum), placebo (aluminum-free), the random ratio is 2:1:1; Dose expansion stage: It is planned to enroll 240 subjects in Rong'an County. The elderly, infants, and infants will be divided into 3 cohorts, and each age group will be randomly divided into low-dose or high-dose groups, with a random ratio of 1:1.According to the order of young adults → adolescents and elderly → toddlers → infants and young children, the dose is from low to high, and the investigator (including the main investigator and the field investigator) will review the safety of the low-dose/placebo group 7 days after the first dose. After the safety data is confirmed, you can enter the high-dose/placebo group for this age group to explore. After DSMB examines the safety data of the first dose of young and middle-aged people to 30 days after the full exemption and confirms safety, they can enter the adolescent and elderly age group; DSMB examines the safety and confirms the safety of the first dose of adolescents and the elderly to 30 days after the full exemption After that, you can enter the infant age group; the investigator (including the main investigator and the field investigator) will review the safety data 7 days after the first dose of the infant low-dose/placebo group and confirm the safety, then you can enter the infant age group explore. The three age groups (cohorts 4 and 6, 7 and 8, 9 and 10) of the elderly, toddlers, and infants can be entered into the corresponding age after the DSMB reviews the safety data of the first dose to 30 days after the full exemption and confirms the safety. In the dose expansion phase (cohorts 11, 12, 13), 80 subjects were enrolled in each cohort (of which, 40 were vaccinated with low-dose trial vaccine and 40 were vaccinated with high-dose trial vaccine).
The purpose of the research is to evaluate the safety and tolerability of the tetravalent recombinant Norovirus vaccine at different doses, to initially explore the immunogenicity of the vaccine, and to determine the appropriate dose of the product for later clinical trials.This trial adopts the seamless design of phase I/IIa, which is carried out in two phases, phase I and phase IIa, phase I is the age/dose climbing phase, and phase IIa is the dose expansion phase.It is planned to enroll 580 subjects, divided into 5 age groups, including: young adults (18-59 years old, 60 people), adolescents (6 -17 years old, 60 people), and elderly (≥60 years old, 160 people) , Toddlers (2-5 years old, 140), infants (6 weeks to 23 months old, 160).The test vaccine contains recombinant HuNoV GI.1-VP1 protein, HuNoV GII.3-VP1 protein, HuNoV GII.4-VP1 protein, HuNoV GII.17-VP1 protein, and each dose contains 12.5μg/type/0.5ml/bottle (Low dose), 25μg/type/0.5ml/piece (high dose).