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Cumulative incidence of childhood-onset IDDM is unaffected by pertussis immunization
H Heijbel1, R T Chen, G Dahlquist
1Swedish Institute of Infectious Disease Control, Stockholm, Sweden. harald.heijbel@smi.ki.se
Insights
Infant pertussis vaccination does not increase the risk of developing type 1 diabetes (IDDM). This study found no difference in IDDM incidence between vaccinated and unvaccinated birth cohorts, refuting a link between pertussis vaccines and diabetes autoimmunity.
Area of Science:
- Immunology
- Endocrinology
- Pediatrics
Background:
- The potential link between childhood vaccinations and autoimmune diseases is a subject of ongoing research.
- Pertussis vaccination is a routine immunization, and its long-term effects require thorough investigation.
Purpose of the Study:
- To investigate whether pertussis vaccination in infancy influences the risk of developing type 1 diabetes (Insulin-Dependent Diabetes Mellitus - IDDM).
Main Methods:
- A comparative study analyzed the cumulative incidence of IDDM in children aged 0-12 years.
- Two birth cohorts with high pertussis vaccination coverage were compared to two cohorts with low coverage after its exclusion from the national program.
- Data on IDDM cases were sourced from the Swedish Childhood Diabetes registry, with vaccine coverage estimated from national records.
Main Results:
- No significant difference in the cumulative incidence rate of IDDM was observed up to age 12.
- This finding held true when comparing birth cohorts with high diphtheria/tetanus/pertussis (DTP) vaccination coverage to those with low pertussis vaccination coverage.
Conclusions:
- The study's findings do not support the hypothesis that pertussis vaccination induces beta-cell autoimmunity, a potential cause of IDDM.
- The comparison of IDDM incidence in cohorts with varying pertussis vaccine exposure suggests no causal relationship.
Objective:
To identify a possible effect of pertussis vaccination in infancy on the risk for developing human IDDM.
Research Design And Methods:
A comparison was made of the cumulative incidence of IDDM in children age 0-12 years between two birth cohorts born before pertussis vaccination and two birth cohorts born after pertussis vaccination had been excluded from the Swedish national immunization program. The Swedish Childhood Diabetes registry was used to identify cases of IDDM. Yearly nurse reports on administered vaccines were used to determine coverage for diphtheria/tetanus/pertussis (DTP) and diphtheria/tetanus (DT) vaccines. Pertussis vaccine coverage was estimated based on number of doses of vaccine made available on license.
Results:
No difference in cumulative incidence rate of IDDM up to the age of 12 years was found when the birth cohorts for 1978 and 1979 with high DTP vaccination coverage were compared with the cohorts of 1980 and 1981 with low pertussis vaccination coverage.
Conclusions:
The comparison of the cumulative incidence of IDDM, up to the age of 12 years, in birth cohorts with high and low exposure to pertussis vaccine does not support the hypothesis that pertussis could induce autoimmunity to the beta-cell that may lead to IDDM.