evidence: Experts say there’s no evidence to support Kirsch’s claim that the mRNA COVID-19 vaccines are contaminated or contain ingredients that weren’t disclosed to regulators. [...] 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