Higher Population Coverage with Typhoid Conjugate Vaccine is Needed to Induce Herd Protection: Evidence from a Cluster-Randomized Trial in Urban Bangladesh
Evidence from a cluster-randomized trial in urban Bangladesh indicates that while the Vi-TT typhoid conjugate vaccine provides high direct protection to recipients, significant herd protection for non-vaccinees is only achieved in clusters with higher overall population coverage, suggesting that vaccinating adults in addition to children is necessary for effective typhoid control.