Routine childhood vaccinations do not increase the risk of epilepsy in young children, according to a new large study led by the US Centers for Disease Control and Prevention.
The research, published in The Journal of Pediatrics, also found that aluminum used in vaccines as an adjuvant does not raise the risk of developing epilepsy. Aluminum adjuvants are commonly added to vaccines to help strengthen the body’s immune response, but they have long been a topic of safety concerns among some parents.
The study analyzed health data from 2,089 children diagnosed with epilepsy between the ages of 1 and 4 years. These children were compared with 20,139 children without epilepsy, matched by age, sex, and health care location. Most of the children included in the research were boys, and nearly 70 percent were between 1 year and 23 months old.
Researchers closely examined routine childhood vaccination schedules and calculated the total amount of aluminum exposure from vaccine adjuvants, measured in milligrams. They looked at commonly used aluminum salts, including aluminum hydroxide, aluminum phosphate, and combined formulations used in vaccines.
The findings showed no increased risk of epilepsy linked to being up to date on vaccinations or to higher cumulative aluminum exposure from vaccines. The researchers reported that the adjusted odds ratios for both factors did not exceed 1.0, meaning no elevated risk was detected.
Instead, the study found that children with known risk factors—such as being born prematurely, having a family history of epilepsy, or having underlying neurological or medical conditions—were far more likely to develop epilepsy than vaccinated children without these conditions.
A smaller subgroup analysis suggested that infants aged 1 to 2 months who received vaccines containing a specific aluminum combination appeared to have slightly higher odds of an epilepsy diagnosis. However, the researchers noted that this finding did not reach statistical significance and could not be considered conclusive.
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Overall, the researchers said the study provides further reassurance about the safety of routine childhood vaccinations, especially at a time when vaccination rates have declined in some communities. They added that the results may help health care providers address parental concerns and support informed decision-making about childhood immunization.
