The belief widely held in the 1990s that the measles, mumps and rubella vaccine could cause autism in small children has no scientific basis at all.

• 这种发育失调疾病的主要症状是语言能力发育迟缓甚至完全丧失语言能力，此外包括紊乱的社会行为以及会经常会重复某一行为举止。