FYI: The J&J vaccine directly injects DNA into the cell nucleus to begin spike protein production. DNA-based vaccines have been tested before (see J&J's Ebola v

FYI: The J&J vaccine directly injects DNA into the cell nucleus to begin spike protein production. DNA-based vaccines have been tested before (see J&J's Ebola vaccine), and I believe the general consensus is that mRNA is a safer technology due to its inherently short lifetime.