NCT06667206

Earlier Prime-BOOST Schedule to Improve MEasles Protection in High Burden Settings

• Status: Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 450 (estimated)
• Sponsor: University of Oxford · Academic / Other
• Sex: All
• Age: 23 Weeks – 28 Weeks
• Healthy volunteers: Accepted

Summary

This is a phase IIb clinical trial investigating the non-inferiority of immune responses in children given two doses of measles vaccine at different timepoints. The study will randomise 450 children to 3 groups: group A will receive measles containing vaccine (MCV) at 6 and 12 months ; group B at 9 and 18 months; Group C at 6 and 18 months.

Detailed description

Two doses of measles containing vaccine (MCV) are recommended in young children with the first dose given at different times depending on the setting. In low-incidence settings the MCV1 is given at 12 months of age or later as more infants over 12 months of age respond to MCV1 due to the absence of maternal antibody interference and an overall better immune response due to the maturation of the infant immune system. In high measles incidence settings MCV1 is given earlier at 9 months of age as there is no remaining protection from maternal antibody at this age and risk of infection if unvaccinated can be high. However, in children born with low levels or rapid decay of maternal antibody, the 9-month timing for MCV1 means the infant may be susceptible to infection for some months prior to vaccination. Therefore, in settings of high infant measles incidence, an early first dose at 6 months of age may bridge this susceptibility gap. Our study will assess differences in protective levels of measles antibody in children randomised to receive early (6 months) or standard (9 months) MCV1 in a high incidence measles setting, and early (12 months) or standard (18 months) booster vaccines, in those who are given early MCV1. There will be 5 blood draws over 2 years. The study will compare children who received a) two doses of measles vaccine at 6 and 18 months with 9 and 18 months, and b) two doses of measles vaccine at 6 and 12 months compared with 6 and 18 months. The study is funded by the Bill \& Melinda Gates Foundation (INV-048650)

Conditions

• Measles

Interventions

Type	Name	Description
BIOLOGICAL	Licenced Measles-Rubella vaccine	Licenced Measles-Rubella vaccine provided by the Ugandan EPI programme

Timeline

• Start date: 2023-11-15
• Primary completion: 2026-05-10
• Completion: 2026-05-10
• First posted: 2024-10-31
• Last updated: 2024-10-31

Locations

1 site across 1 country: Uganda