Data from nearly 400,000 children who received combined vaccines for diphtheria-tetanus-pertussis, inactivated polio virus and Haemophilus influenza type B showed that 7,811 of them had febrile seizures before age 18 months, most of which were unrelated to vaccination. The Danish study found that the risk of experiencing febrile seizures was six times higher on the day of the initial dose and almost four times higher on the day of the second dose, but the overall risk was very low. The findings appear in the Journal of the American Medical Association.

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