美国总统特朗普于2026年8月10日签署行政令，将儿童疫苗推荐数量从18种减少至11种[1]。新方案将疫苗分为三类：针对所有儿童的11种疫苗、针对高风险人群的疫苗，以及需要医患共同决策的疫苗[1]。这一调整使美国的标准更接近世界卫生组织的基础推荐标准[1]。
行政令建议将全球通用的MMR联合疫苗分离为单独接种[1]，但美国疾病控制与预防中心对此提出质疑，指出无科学证据支持分离接种的做法[1]。美国儿科学会主席Andrew Racine表示该令"不基于金标准科学"[1]。
President Trump signed an executive order on August 10, 2026, that cuts the number of recommended childhood vaccines from 18 to 11[1]. The new directive categorizes vaccines into three tiers: 11 vaccines recommended for all children, vaccines for high-risk populations, and vaccines requiring shared decision-making between parents and healthcare providers[1]. This reduction brings the United States closer to the World Health Organization's baseline vaccine recommendations[1].
The order recommends separating the combined MMR vaccine—which protects against measles, mumps, and rubella—into individual injections[1]. However, the U.S. Centers for Disease Control and Prevention stated that no scientific evidence supports this approach and emphasized that the MMR vaccine has no link to autism[1]. Andrew Racine, president of the American Academy of Pediatrics, characterized the executive order as "not based on gold standard science"[1].