Which vaccines have the strongest death-reduction evidence in children?

The short version: measles and rotavirus vaccines have the strongest death-reduction evidence in children, and both rest on modeled or observational data, not randomized trials with death as the endpoint.

Measles is the clearest case. A modeling study credits measles immunization with roughly 57 million deaths prevented globally from 2000 to 2022, and 93.7 million lives saved from 1974 to 2024, more than 60% of all lives saved by routine childhood immunization [1]. That is a counterfactual model, not a trial. Rotavirus is next: a global model estimated about 139,000 deaths prevented from 2006 to 2019, and observational data from 49 countries showed a median 36% drop in diarrhea deaths [1]. Brazil's program saw a 9.9% fall in diarrhea-specific mortality [1]. Pneumococcal conjugate vaccine shows real reductions in pneumonia deaths in South Africa and hospitalizations in Ecuador, but the mortality figures come from ecological modeling [1]. The Finnish PCV10 program found a mortality trend that was not statistically significant [5].

The counterweight is DTP. A Guinea-Bissau study found roughly double the mortality in DTP-vaccinated children versus unvaccinated [2], and a meta-analysis found girls given three DTP doses died at 1.66 times the rate of boys [3]. A 2024 review argues those signals are confined to Guinea-Bissau and confounded [4]. That dispute is unresolved, and it matters because DTP is on every schedule.

My call: measles and rotavirus have the strongest child mortality evidence, but it is modeled, not trial-proven, and DTP carries an unresolved mortality signal that the schedule ignores. Confidence: moderate for measles and rotavirus, low for PCV mortality, and not clear for DTP.