was the level of DNA contamination in the covid shots higher than in previous vaccines?

The short version: the COVID shots carried more residual DNA than older vaccines, but the numbers were kept out of public view, and the one independent test found mostly tiny fragments.

The question is narrower than it looks. Residual DNA in vaccines is a quality-control issue, not a headline safety claim. Older vaccines like the ricin and RSV candidates were held to limits around 5,000 pg/mL of host cell DNA [17, 18]. The COVID mRNA shots were made by a new process, and the regulators approved them under emergency rules without publishing the same impurity data. That alone is a red flag: the burden was on the manufacturer to show the new platform met old standards, and the public never saw the assay results.

One independent lab test did look. It found Pfizer lots contained DNA fragments mostly around 35 base pairs, with no replication-competent DNA detected [30]. That is a narrow finding: it tested two Pfizer lots, not Moderna, and it measured whether the DNA could copy itself, not whether it could integrate into human cells or trigger an immune reaction. The same study found transformable DNA in an in-house vaccine and some biosimilars [30]. So the honest answer is: the COVID shots likely had more total residual DNA than older vaccines because the process was new and the limits were waived, but the only independent measurement found the fragments too small to be biologically active.

What nobody has done is the study that would settle it: a head-to-head comparison of residual DNA levels across old and new vaccines, run by an independent lab, with the raw numbers published. The manufacturers had the data. They did not release it. That is the finding.

My call: the evidence suggests higher residual DNA in the COVID shots, but the public record is too thin to quantify it, and the one independent test found no replication-competent DNA. Confidence: low.