Facebook has removed a video posted to Donald Trump’s personal account, saying it violated a policy against harmful COVID-19 misinformation. Twitter has also banned the video, which featured clips from a Fox News segment Wednesday in which Trump urged schools to reopen, falsely claiming children are “almost immune from this disease.”

Nearly a quarter-million U.S. children have tested positive for the coronavirus, with hundreds suffering from multisystem inflammatory syndrome. At least six U.S. children have died of COVID-19. In Mississippi, 116 students have been sent home to quarantine after six students and one staff member tested positive in a newly reopened school in the city of Corinth.

Researchers warn that for many children there may be lasting consequences from the novel coronavirus, including lung damage and neurological side effects. This comes as a large contact tracing study in South Korea found children and teens between the ages of 10 and 19 are more likely to spread the coronavirus than young children or adults.