Vaccine skepticism and distrust of pharmaceutical companies long predated RFK, Jr.'s 2024 presidential campaign. But the distrust of mainstream medical authority has now grown so deep that the United States can no longer contain the spread of measles. The country’s measles-vaccination rates have dropped below the threshold for herd immunity. Obviously, Trump’s misleading vax ruminations from the Oval Office have not helped the matter. The New Yorker’s Ruby Cramer discusses her reporting on one family’s frightening medical experience after one parent fell down the MAHA rabbit hole.