Methods In this phase 3, double-blind, randomised controlled efficacy trial in Blantyre, Malawi, healthy children aged 9 months to 12 years were randomly assigned (1:1) by an unmasked statistician to receive a single dose of Vi polysaccharide conjugated to tetanus toxoid vaccine (Vi-TT) or meningococcal capsular group A conjugate (MenA) vaccine.儿童必须先前没有伤寒疫苗的历史,并且居住在研究区域以纳入,并是从公立学校和卫生中心招募的。参与者,他们的父母或监护人以及学习团队被掩盖以疫苗分配。违反了疫苗的护士。我们对从疫苗接种到随访完成的高温疾病进行了监视。主要结果是首先出现了血液培养确认的伤寒。合格的儿童被随机分配和接种疫苗,包括在意向性治疗分析中。该试验在clinicaltrials.gov,NCT03299426上注册。