This week, it was announced that a patient in the United Kingdom had been cured of H.I.V. The “London Patient” is only the second person with H.I.V. to be cured of the disease since its discovery, in 1981. The breakthrough comes weeks after President Trump announced a plan to eradicate the disease by 2030. Jerome Groopman joins Dorothy Wickenden to discuss how previous Administrations have addressed the AIDS crisis, and the politics of science and medicine in the Trump era—on everything from the anti-vaccine movement to climate-change denialism.