antivaxxer
noun [ C ] mainly US informal uk/ˌæn.tiˈvæks.ər/ us/-ɚ/
反对疫苗接种的人（尤指父母）
someone who does not agree with vaccinating people (= giving them injections to prevent disease), especially parents who do not want their children to be vaccinated
One antivaxxer changed her position when three of her children contracted whooping cough. 当她自己孩子中有三个染上百日咳的时候，这名反对疫苗接种的母亲改变了立场。