A new preprint study led by the U.S. Food and Drug Administration (FDA) has detected a potential “safety signal” for seizures and convulsions in young children after receiving the monovalent Pfizer or Moderna mRNA COVID-19 vaccines.
The median time between vaccination and seizures or convulsions was two days, with 32% occurring the day of or the day after vaccination.
The study reviewed 21 pre-specified health outcomes after exposure to the Pfizer, Moderna and Novavax monovalent COVID-19 vaccines in children 6 months to 17 years, and identified only these two safety signals as statistically significant.
First, despite the data described above, the authors concluded they did not find a strong pattern of clustering near the date of vaccination (day 0 or 1).
Approximately 56% of children 6 months to 17 years — a total of 40.5 million — have not received a first dose of the COVID-19 vaccine.
Vaccination for children under 12 began on Nov. 2, 2021, when the CDC recommended Pfizer’s vaccine for children ages 5-11.
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