Trust, in vaccines and AI, is earned only with evidence

In 2007 The BMJ’s readers voted vaccination as one of the most important medical milestones since the journal began in 1840. Vaccines are estimated to have saved hundreds of millions of lives worldwide, primarily among children. A robust evidence base has shown vaccines to be safe and effective.1 Who would want to undermine one of the greatest public health achievements?Last week the US president, Donald Trump, and his health secretary, Robert F Kennedy Jr—both long term vaccine sceptics—did just that by signing an executive order to reduce the vaccinations US children receive and to deliver MMR vaccination as separate doses (doi:10.1136/bmj-2026-100549).2 This shows “an ambivalence towards vaccines and the evidence base that supports them,” write Tiago Correia and colleagues, and will reduce uptake and trust in vaccines that won’t be easy to recover, making outbreaks of vaccine preventable diseases certain (doi:10.1136/bmj-2026-100562).3The executive order was issued shortly after a US Senate…