re: Pfizer vaccine contaminated with DNA

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Pfizer vaccine contaminated with DNA

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A spokesperson from the U.S. Food and Drug Administration told us in an email that “no safety concerns related to residual DNA have been identified.” The spokesperson added that “with regard to the mRNA vaccines, while concerns have been raised previously as theoretical issues, available scientific evidence supports the conclusion that the minute amounts of residual DNA do not cause cancer or changes to a person’s genetic code.”

A spokesperson for the European Medicines Agency — which helps regulate medical products in the European Union — told us via email that the agency “can confirm that we have not seen any reliable evidence of residual DNA exceeding approved/safe levels” for the Pfizer/BioNTech or Moderna COVID-19 vaccines. Nor is the EMA “aware of scientific evidence showing that the very small amounts of residual DNA that may be present in vaccine batches could integrate into the DNA of vaccinated individuals,” the spokesperson continued.

Various experts also told us that it is unlikely that residual DNA in the vaccines could integrate into DNA or cause cancer, even in theory. And as we have previously written, there isn’t evidence to date that the vaccines cause cancer or have led to an increase in cancer.

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