特朗普签署新的行政令，建议将麻疹、腮腺炎和风疹三联疫苗分离为单独注射，并改变儿童疫苗接种时间表[1]。医学界对此普遍表示反对，认为这一举措缺乏科学依据，将在疫苗接种率下降、疫情风险上升的时期加剧家长的恐慌和困惑。
美国儿科学会主席Andrew Racine指出，数十项设计良好的全球研究已"明确证实"疫苗与自闭症无关[1]。医生强调，现有三联疫苗已被证明安全有效，分离接种不会产生更好的免疫反应[1]。然而，美国目前不存在针对儿童的单独麻疹、腮腺炎或风疹疫苗[1]，这意味着该令的实施面临现实障碍。
疫苗政策的变动正值严峻的公共卫生时期。美国正面临最近30多年来规模最大的麻疹疫情[1]，同时2024-25学年幼儿园的疫苗豁免率创历史新高[1]。此外，FDA已下令解雇17名疫苗咨询委员会成员，并改换倾向于提出更限制性建议的成员[1]。美国儿科学会2026年免疫计划建议对18种疾病进行疫苗保护[1]。
President Trump has signed an executive order proposing to separate the measles, mumps, and rubella combination vaccine into three individual injections and to alter the childhood vaccination schedule [1]. The medical community has responded with broad opposition, citing a lack of scientific justification for the changes.
The American Academy of Pediatrics' president, Andrew Racine, stated that dozens of well-designed global studies have "definitively established" that vaccines are not linked to autism [1]. Medical experts emphasize that the existing combined MMR vaccine has been proven safe and effective through decades of research, and that separating the injections would not produce better immune responses [1]. Additionally, the United States currently has no individually available measles, mumps, or rubella vaccines for children, making the proposed separation logistically unfeasible [1].
The timing of the order has intensified concerns within the medical field. The U.S. is facing its largest measles outbreak in more than 30 years [1], while kindergarten vaccine exemption rates reached a historic high during the 2024-25 school year [1]. Doctors warn that the executive order will amplify parental anxiety and confusion, particularly during this period of rising measles cases and declining vaccination coverage [1]. Trump has previously characterized the current MMR vaccine as "probably pretty deadly" [1]. The order also directs the FDA to remove 17 members from its vaccine advisory committee and install replacements favoring more restrictive recommendations [1].