The vaccination rate was significantly lower among younger siblings of 206 children with autism spectrum disorder in California than among controls. Parents of children with this disorder reported adverse reactions to vaccination in older children and younger siblings.

中文翻译：

---

自闭症儿童的年轻兄弟姐妹的疫苗接种率

加利福尼亚州206名自闭症谱系障碍儿童的较年轻兄弟姐妹的疫苗接种率显着低于对照组。患有这种疾病的儿童的父母报告说年龄较大的孩子和较小的兄弟姐妹对疫苗接种有不良反应。