Between Nov @ , @ , and Feb @ , @ , we randomly assigned @ participants to receive the low dose ( n = @ ) , the medium dose ( n = @ ) , or the high dose ( n = @ ) of the measles-virus-based candidate vaccine , or Priorix ( n = @ ) , of whom @ participants ( @ % ; n = @ , n = @ , n = @ , n = @ , respectively ) were included in the per-protocol population .