Highly developed nations requiring the most neonatal vaccine doses tend to have the worst mortality rates in children under age 5, according to a peer-reviewed study published July 20 in Cureus.
Researchers Neil Miller, director of the Institute of Medical and Scientific Inquiry in New Mexico, and Gary Goldman, who has a doctorate in computer science, performed several analyses based on 2019 and 2021 data to explore potential relationships between the number of early childhood vaccinations required by developed nations and their neonatal, infant, and under age 5 mortality rates.
According to global health experts, few measures in public health can compare with the impact of vaccines, which are credited with having reduced disease, disability, and death from a variety of infectious diseases. Yet the study found that developed nations requiring more neonatal vaccinations may have unintended consequences that increase childhood mortality, challenging the idea that more vaccines administered always results in fewer deaths.
"Our paper investigated potential associations between the number of early childhood vaccine doses that developed nations require and their early childhood mortality rates," Mr. Miller told The Epoch Times in an email. "For example, some nations administer hepatitis B and tuberculosis (BCG) vaccines to their infants shortly after birth. We found that nations that require both vaccines had significantly worse infant mortality rates when compared to nations that require neither vaccine."
Miller and Goldman's research initially began in 2011 when they
published a paper using 2009 data showing less favorable infant mortality rates among highly developed nations requiring the most infant vaccinations.
The recent study replicated their original study using 2019 and 2021 data from the top 50 nations where childhood vaccine doses range from 12 to 26. Results showed the infant mortality rate increased by 0.167 deaths per 1,000 live births for each additional vaccine dose added to the vaccination schedule, supporting the earlier study's findings.
Twenty-nine nations in 2009 had better infant mortality rates than the United States, but by 2019, the United States had declined to 44th in infant mortality rankings, and in 2021, ranked 50th-despite requiring the highest number of infant vaccines.
Hepatitis B and Tuberculosis Vaccination May Increase Mortality
In their latest study, Miller and Goldman broadened their research to assess the impact of hepatitis and tuberculosis vaccines on mortality rates of neonatal infants (babies under 28 days old), infants up to age 1, and children under 5. Mortality data and vaccination schedules were compiled from UNICEF, the World Health Organization, the European Centre for Disease Prevention and Control, and national governments.
Nations were then grouped based on whether they required zero, one, or two vaccine doses given to newborns to determine their statistical significance to mortality rates of the three age groups. The association demonstrated by the analysis showed neonatal vaccines for hepatitis B and tuberculosis may not contribute to an overall reduction in mortality in nations where infants are at low risk of mortality from diseases the vaccines are targeting. In these nations, infants may actually experience greater risks from vaccination.
Reduction in Infant Vaccine Doses Decreased Mortality
Using 2021 data, the researchers found a statistically significant difference of 1.28 deaths per 1000 live births between the mean infant mortality rates among nations that did not vaccinate their neonates at all and those that required two vaccine doses. For each reduction of six vaccine doses administered during infancy, the infant mortality rate improved by approximately one death per 1,000 live births.
Additionally, vaccines administered during the first year of life had a greater effect on under age 5 mortality rates compared with vaccines administered in the second through fifth years of life, suggesting younger infants who generally weigh less and receive more vaccines in a shorter period are significantly more likely to experience an adverse reaction resulting in hospitalization or death.
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