At a recent Senate hearing, Sen. Ron Johnson @SenRonJohnsonUS and Dr. Wafik El-Deiry discussed claims about mRNA vaccine design and contaminants. Key points they raised:

- The mRNA in some vaccines uses pseudouridine, a modification that increases stability. They cited a study suggesting detectable circulation up to ~700 days, and said longer follow-up hasn’t been published.

- They referenced independent lab reports (e.g., McKernan, Speicher, Rose) alleging DNA contaminants, including SV40 enhancer/promoter sequences, at levels above older FDA thresholds for “naked” DNA.

- They emphasized that lipid nanoparticles can deliver cargo into cells, so they argued DNA contaminants could theoretically enter cells too, while acknowledging there is no definitive clinical proof of harm.

- They criticized FDA/NIH/CDC for what they described as dismissing safety signals without “definitive proof.”

This is a summary of their statements at the hearing, not an endorsement or rebuttal. For context, regulatory agencies and many independent scientists have repeatedly stated that authorized mRNA vaccines meet safety and quality standards, and that reported contaminants have been investigated under existing frameworks. Readers interested in details can look for the original hearing transcript, the cited lab papers, and regulatory responses.

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