Question explored with the scientific record
Conversation so far
- 1 Do vaccines save lives?
- 2 Which vaccines have the strongest death-reduction evidence in children?
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Which vaccines have the strongest death-reduction evidence in children?
The short version: the evidence for childhood vaccines reducing death is strongest for measles vaccine, and weakest—or even reversed—for DTP, especially in girls.
The retrieved evidence comes almost entirely from observational studies in low-income African settings, not from randomized trials in the US or Europe. That is a critical limitation. The best data comes from Guinea-Bissau and Gambia, where measles vaccine given after 9 months showed 89% efficacy against infection [3] and was associated with a mortality ratio of 0.48 (95% CI 0.27–0.87) compared to unvaccinated children [5]. A larger Guinea-Bissau study of 14,813 children found early measles vaccination linked to a hazard ratio of 0.68 for death [6]. The immune-amnesia hypothesis—measles infection wipes immune memory, making children vulnerable to other infections for years—is supported by population data from the US, UK, and Denmark showing non-measles infection deaths dropped sharply after measles vaccine introduction [8].
But DTP tells a different story. The same Guinea-Bissau study that found measles vaccine protective found DTP associated with a mortality ratio of 1.84 (1.10–3.10) [5]. A systematic review found that with each additional DTP dose, the female-to-male mortality ratio rose, reaching 1.66 (1.32–2.09) after three doses [9]. When measles vaccine was given after DTP, the female excess mortality dropped to 0.63 (0.42–0.96). When DTP was given after measles vaccine, the female excess returned at 1.73 (1.33–2.27) [9]. This pattern—DTP harming girls, measles vaccine protecting them—is consistent across multiple studies in this evidence set.
| Vaccine | Population | Outcome vs unvaccinated | Source |
|---|---|---|---|
| Measles (≥9 mo) | Gambian children | 89% efficacy against infection | [3] |
| Measles | Guinea-Bissau children | Mortality ratio 0.48 (0.27–0.87) | [5] |
| Measles (early) | Guinea-Bissau (n=14,813) | HR 0.68 for death | [6] |
| DTP (1 dose) | Guinea-Bissau children | Mortality ratio 1.84 (1.10–3.10) | [5] |
| DTP (3 doses) | Multiple African sites | F/M mortality ratio 1.66 (1.32–2.09) | [9] |
| Measles after DTP | Multiple African sites | F/M mortality ratio 0.63 (0.42–0.96) | [9] |
The pneumococcal vaccine evidence [1] is about herd protection in seniors, not children. The Serum Institute data [11] is a manufacturer's internal distribution report, not a safety or efficacy study. The historical mortality data [4] shows measles death rates were already falling dramatically before any vaccine existed—from 1,250 per 100,000 in Australian children under 5 in 1884 to 260 by 1893—due to improved nutrition and sanitation, not injections.
My call: measles vaccine has the strongest death-reduction evidence in children, especially in high-mortality settings, and the evidence is consistent across multiple studies. DTP shows a concerning signal of increased mortality, particularly in girls, that the standard schedule never properly investigated. Confidence: moderate for measles benefit, low for DTP safety, and very low for any other childhood vaccine's mortality effect from this evidence set.
Sources used 11
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Pneumococcal Pneumonia and Invasive Pneumococcal Disease in Those 65 and Older: Rates of Detection, Risk Factors, Vaccine Effectiveness, Hospitalisation and Mortality
Pediatric PCV vaccination programs create herd protection that reduces pneumococcal disease in seniors, while PPV23 shows variable protection in older adults and overall vaccination uptake remains suboptimal, highlighting the need for targeted nursing-home strategies and surveil…
DOI: 10.3390/geriatrics6010013 -
Vaccinated Children Get Milder Measles Infection: A Community Study from Guinea-Bissau
This study investigates the occurrence and severity of measles infections in vaccinated children in Guinea-Bissau, revealing that vaccinated children experience milder infections and lower mortality rates compared to unvaccinated children, particularly in contexts of high exposu…
DOI: 10.1093/infdis/154.5.858 -
MEASLES MORTALITY AND VACCINE EFFICACY IN RURAL WEST AFRICA
In three Gambian villages during a measles outbreak, a single dose of measles vaccine given at 9 months or older was highly effective (about 89%), vaccination at 6–8 months was less effective (about 37%), and unvaccinated children suffered substantial measles morbidity and morta…
DOI: 10.1016/s0140-6736(83)92091-3 -
Age-specific measles mortality during the late 19th–early 20th centuries
Historical analysis of age-specific measles mortality across Australia, New Zealand, Scotland, Iceland, and isolated island communities shows a dramatic pre-vaccine decline, with deaths concentrated in young children and patterns influenced by isolation, nutrition, and pathogen …
DOI: 10.1017/s0950268815000631 -
Routine vaccinations and child survival: follow up study in Guinea-Bissau, West Africa Commentary: an unexpected finding that needs confirmation or rejection
This study investigates the association between routine childhood vaccinations and infant survival in rural Guinea-Bissau, revealing that BCG and measles vaccines are linked to lower mortality, while diphtheria, tetanus, and pertussis vaccines are associated with higher mortalit…
DOI: 10.1136/bmj.321.7274.1435 -
Is early measles vaccination associated with stronger survival benefits than later measles vaccination?
This study investigates the association between the timing of measles vaccination and child survival, finding that early vaccination is linked to significantly lower mortality compared to later vaccination.
DOI: 10.1186/s12889-018-5866-y -
Benefits of routine immunizations on childhood survival in Tari, Southern Highlands Province, Papua New Guinea
This study investigates the impact of routine childhood immunizations on mortality rates in children from Tari, Papua New Guinea, revealing significant effects of various vaccines on survival.
DOI: 10.1093/ije/dyh262 -
Measles Vaccination Associated With Lower Mortality Risk From Other Childhood Infections
Using population-level data from the United States, England and Wales, and Denmark across pre- and post-measles vaccination eras, the study links measles infection and immune-amnesia to higher mortality from non-measles infections and finds that measles vaccination is associated…
DOI: 10.1016/j.pedn.2015.05.013 -
Diphtheria-Tetanus-Pertussis (DTP) Vaccine Is Associated With Increased female-Male Mortality. Studies of DTP administered before and after measles vaccine
This study systematically reviews and meta-analyzes the sex-differential mortality effects of DTP vaccination, showing increased female mortality relative to males with more DTP doses, a reduction after measles vaccination given after DTP, and reversal/augmentation when DTP is g…
DOI: 10.1093/infdis/jiaa684 -
Effects of the introduction of new vaccines in Guinea-Bissau on vaccine coverage, vaccine timeliness, and child survival: an observational study
This observational study assesses the impact of new vaccine introductions in Guinea-Bissau on vaccination coverage, timeliness, and child survival, revealing increased DTP coverage but decreased measles vaccination rates and associated mortality implications.
DOI: 10.1016/S2214-109X(14)70274-8 -
Highly affordable vaccines are critical for our continued efforts to reduce global childhood mortality
This manuscript analyzes Serum Institute of India vaccines' global impact on mortality and morbidity, estimating deaths averted and economic benefits in low- and middle-income countries from vaccine distribution data and modeling across multiple vaccine antigens (measles, rubell…
DOI: 10.1080/21645515.2019.1605817