evidence: Although ivermectin is approved for use to treat parasitic roundworm infections in humans, the Food and Drug Administration has not approved the use of this anti-parasitic drug to prevent or treat Covid-19, and studies of use of it for those purposes have been inconclusive. The FDA says current data "do not show ivermectin is effective against Covid-19" and using it for that purpose in humans or animals "can be highly dangerous." [...] Conservative media personalities have long promoted the use of the anti-parasitic drug ivermectin to prevent or treat Covid-19. For example, in a show on March 8, 2021, Fox News' Laura Ingraham said: "And we know that our FDA has in many ways failed us by not allowing for the use of ivermectin and hydroxychloroquine, both of which are used around the world to reduce Covid hospitalizations and deaths." [...] Just 1 in 10 Americans (10%) say the statement "ivermectin is an effective treatment for Covid-19" is true, compared with 27% who say it is false. A majority of Americans (63%) say they are not sure whether that statement is true or not.