Fact-checked: Yes, mRNA vaccines have been tested on humans
Claims that COVID-19 vaccines that use mRNA technology (including the Pfizer and Moderna jabs) have never been tested on human beings circulates widely on social media alongside allegations that they have been considered too dangerous to use. In reality, mRNA vaccine testing began as early as 2015 to combat influenza, and were later adapted for use against COVID-19. Tens of thousands of people were tested before the vaccines were approved for the general populace. Politifacthas fact-checked this persistent rumour.