Patterns of childhood immunization and all-cause mortality

Area of Science:

• Pediatric Health
• Immunization Safety
• Public Health

Background:

• Childhood immunization schedules are generally safe, but parental vaccine hesitancy is rising.
• All-cause mortality is a key outcome for evaluating immunization schedule safety.
• Further research is needed to address parental concerns about vaccine delays.

Purpose of the Study:

• To investigate the association between childhood vaccination status and all-cause mortality.
• To evaluate the safety of the recommended immunization schedule concerning mortality risks.
• To provide evidence-based information for parents considering vaccination schedules.

Main Methods:

• A cohort study of over 300,000 children from the Vaccine Safety Datalink (VSD) was conducted.
• Vaccination patterns were assessed up to 18 months, and mortality was tracked until 48 months.
• Cox proportional hazards models were used to compare mortality rates between vaccinated and undervaccinated children, adjusting for confounders.

Main Results:

• No significant difference in all-cause mortality rates was observed between children vaccinated on schedule and those undervaccinated.
• Mortality rates were 2.28 per 100,000 person-years for scheduled vaccination and 2.57 for undervaccination.
• The incidence rate ratio (IRR) for mortality was not statistically significant in either analysis (with or without unknown causes of death).

Conclusions:

• The study findings do not suggest an increased risk of all-cause mortality associated with undervaccination compared to the recommended immunization schedule.
• Current evidence supports the safety of the established childhood immunization schedule regarding all-cause mortality.
• These results can help inform discussions about vaccine safety and address parental concerns.