A research paper was published 24 June 2021 in the open access peer-reviewed journalVaccines titled “The Safety of COVID-19 Vaccinations—We Should Rethink the Policy”.
According to that paper the authors did the study because up until now “COVID-19 vaccines have had expedited reviews without sufficient safety data. We wanted to compare risks and benefits.”
They calculated the number of people that needed to be vaccinated (NNTV) to prevent one death using a large Israeli field study. They accessed the Adverse Drug Reactions (ADR) database of the European Medicines Agency and of the Dutch National Register (lareb.nl) to extract the number of cases reporting severe side effects and the number of cases with fatal side effects.
As a result they found that the NNTV is between 200–700 to prevent one case of COVID-19 for the Pfizer mRNA experimental injection, while the NNTV to prevent one death is between 9000 and 50,000 (95% confidence interval), with 16,000 as a point estimate.