A viral video featuring a doctor at a school board meeting in the United States has spread the unsubstantiated claim that the rise in COVID-19 cases over the summer has been due to an exceptionally rare medical phenomenon. This condition, called ‘antibody dependent enhancement’, causes a vaccinated individual to experience more severe symptoms after an infection. In order for this claim to be true, the majority of new COVID-19 cases would have to be in vaccinated people, when in reality the opposite is true: the vast majority of new cases are occurring in people who have not been vaccinated. Politifact has debunked this doctor’s unsupported claims.