evidence: Experts said there’s no evidence that the mRNA COVID-19 vaccines contain previously undisclosed contaminants. Pfizer said noninfectious SV40 sequences were part of the starting material for the Pfizer vaccine, and the FDA and other regulators approved the vaccine manufacturing process. [...] Health Feedback, Claim that COVID-19 mRNA vaccines contain DNA contaminants based on study of vials of "unknown provenance"; no evidence COVID-19 mRNA vaccines can alter DNA in people, June 23, 2023 [...] Health Feedback, Contrary to viral claim, regulatory agencies knew of residual DNA in COVID-19 mRNA vaccines; no evidence this poses health concern, Oct. 25, 2023