Genomics researcher Kevin McKernan identified SV40 promoter-enhancer sequences and residual plasmid DNA in Pfizer and Moderna mRNA vaccines. A peer-reviewed study in Autoimmunity found DNA exceeded FDA regulatory limits by 36-153x for Pfizer and 112-627x for Moderna using fluorometry. Two of six Pfizer lots exceeded regulatory limits for SV40 sequences specifically. Regulators have not mandated recalls despite the findings.
“We found DNA contamination levels in the COVID mRNA vaccines that far exceed the FDA's own regulatory limits, including sequences from the SV40 promoter-enhancer-ori.”
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The Claim Is Made
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When genomics researcher Kevin McKernan began examining the molecular composition of mRNA COVID-19 vaccines in 2021, he wasn't looking for a controversy. He was simply applying standard quality control techniques used in pharmaceutical manufacturing. What he found, however, would trigger a years-long debate about regulatory oversight and transparency in vaccine production.
McKernan's initial findings centered on two concerns: the presence of SV40 promoter-enhancer sequences in the vaccines and levels of residual plasmid DNA that appeared to exceed FDA manufacturing standards. The SV40 sequence is derived from a virus used in the plasmid construction process—the bacterial DNA used to manufacture the mRNA. While manufacturers argued these sequences were inactive fragments from production, the discovery raised questions about whether adequate purification had occurred.
When McKernan published preliminary findings, health authorities were quick to dismiss them. The FDA and manufacturers maintained that residual DNA was expected in mRNA vaccine production and that any present posed no health risk. Regulatory agencies emphasized that their standards focused on the final product's safety and efficacy, not the absence of all manufacturing byproducts. This response reflected the standard position: contamination at undetectable or negligible levels was simply part of manufacturing reality.
But McKernan didn't stop there. Working with collaborators, he conducted more rigorous quantification using fluorometry, a precise measurement technique. The peer-reviewed study published in Autoimmunity in 2022 provided specific numbers that would prove difficult to dismiss. For Pfizer vaccines, residual DNA exceeded FDA limits by 36 to 153 times across tested lots. For Moderna, the excess was even more dramatic: 112 to 627 times the regulatory threshold.
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The findings regarding SV40 sequences were equally specific. Two of six Pfizer vaccine lots tested contained SV40 promoter-enhancer sequences at levels exceeding regulatory limits. These weren't theoretical concerns—they were quantifiable measurements from actual vaccine vials obtained through standard pharmaceutical supply channels.
What followed was notable for what didn't happen. No mandatory recalls were issued. No emergency regulatory reviews were announced. Instead, a pattern emerged of technical rebuttals focusing on methodological questions rather than engaging with the core findings. Some regulators suggested that their DNA limits might not apply to these specific contaminants, or that the measurement methods needed reconsideration. The debate shifted from whether the contamination existed to whether it mattered.
This situation reveals something important about how institutional trust functions during crises. When an independent researcher's findings contradict regulatory assurances, the response often determines public confidence more than the underlying science. Dismissing concerns without transparent investigation creates space for skepticism to flourish.
The question isn't whether small amounts of DNA contamination automatically means vaccines are unsafe—the biological mechanisms would matter enormously. The question is whether the public deserves clear, transparent answers when documented measurements suggest manufacturing standards may not have been met. Whether you believe the contamination poses genuine risk or not, the lack of definitive regulatory response to specific quantitative findings represents exactly the kind of gap that erodes institutional credibility.
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~300Network
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