A new study from Lund University in Sweden on how the Pfizer-BioNTech COVID-19 vaccine affects human liver cells under experimental conditions, has been viewed more than 800,000 times in just over a week. A previous study from MIT has indicated that the SARS-CoV-2 virus mRNA can be converted to DNA and integrated into the human genome. Indeed, about 8 percent of human DNA comes from viruses inserted into our genomes during evolution. Does the Pfizer-BioNTech mRNA vaccine get converted to DNA or not? We show that the vaccine enters liver cells as early as 6 hours after the vaccine has been administered. We saw that there was DNA converted from the vaccine's mRNA in the host cells we studied. These findings were observed in petri dishes under experimental conditions, but we do not yet know if the converted DNA is integrated into the cells' DNA in the genome - and if so, if it has any consequences. About 18 percent of the vaccine accumulates in the liver just 30 minutes after the vaccine is injected in mice as reported by Pfizer in EMA assessment report, and therefore we chose to study liver cells. This also explains the choice of vaccine concentrations in our study ... which are 0.5-2% of the injection site concentration. We think it is self-evident that this type of research should be pursued. We have a new vaccine, and ... it is also a bit surprising that such studies do not seem to have been carried out before.