'The UKHSA said that, besides young children, “susceptibility to measles is particularly high among 19- to 25-year-olds, affected by unfounded stories in the early 2000s” that MMR caused autism. It said these “Wakefield cohorts” of unvaccinated young adults — named after Andrew Wakefield, who promoted the now discredited idea that MMR jabs had unacceptable side-effects — would be most vulnerable in a large outbreak.'

https://www.ft.com/content/fc73cd65-7a11-4877-aeac-966c0321d5a3