Can mRNA vaccines change my DNA?
Here is what the checked sources say. Each title links to the original.
News & Views: 3 Questions You Will Get About the New mRNA Vaccines
CHOP's explainer (December 2020, updated September 2021) says why the mRNA in COVID-19 vaccines is not expected to alter a person's DNA. It says the vaccine mRNA cannot enter the cell nucleus, where DNA is kept, and is broken down by the body; CHOP says its half-life in human cells is estimated in hours and that it will not lead to protein production for more than about 10 to 14 days. The page was written before the 2022 lab study on liver cancer cells described elsewhere in this library.
Intracellular Reverse Transcription of Pfizer BioNTech COVID-19 mRNA Vaccine BNT162b2 In Vitro in Human Liver Cell Line
A 2022 Lund University lab study. Researchers exposed a line of human liver cancer cells (Huh7) in a dish to the Pfizer vaccine. They reported changes in LINE-1, a reverse transcriptase that human cells make themselves, and detected DNA copies of the vaccine sequence within 6 hours. The authors stated they did not know whether that DNA had integrated into the cells' genome. The study did not involve people or healthy cells.
Study by Lund University researchers didn't show that COVID-19 mRNA vaccines change our DNA
Reviews the 2022 Lund liver-cell study. It agrees the study found vaccine mRNA copied into DNA inside the cells, but notes the cells were cancer cells, which tend to carry more LINE-1, and the amount of vaccine they were exposed to was much larger relative to the number of cells than a person gets. The study did not show the DNA entering the nucleus or joining the genome; it used no method that could detect integration. Science Feedback says the artificial lab system means the results cannot be extrapolated to vaccinated people.
Posts Falsely Claim FDA 'Required' to Take mRNA COVID-19 Vaccines Off Market Due to Adulteration
In a November 2023 fact-check, FactCheck.org says mRNA vaccines can contain tiny leftover DNA fragments from the plasmid used early in manufacturing, and regulators require quality checks to keep this residual DNA under a limit. Claims of excess DNA came from unpublished vial tests that have been criticized. As of 2023, it found no reliable evidence the DNA exceeds limits, integrates into a person's genome or causes cancer. The Pfizer plasmid contains short SV40-derived sequences, not the virus; Health Canada said that fragment was inactive and measured consistently below its limit.