There has been concern that the measles, mumps, and rubella vaccine may trigger autism since autistic symptoms typically do not show up until the child is two. About the same time that first MMR shot is given.
A study of more than half a million children in Denmark finds there really is no connection between the vaccine and autism. That in fact, autism was found more in children who had not had the vaccine than among those who were given that shot a number of studies over the past few years have failed to find a connection. This newest evidence is published in the New England Journal of Medicine.
It is estimated that about one in 1,000 children have autism. Also, as many as two to five per 1,000 children may exhibit some form of the disorder. Autism is a term that refers to a collection of neurologically-based developmental disorders which cause problems with social interaction and communication skills, along with a tendency to have repetitive behaviors or interests. Autism is typically diagnosed during the toddler or preschool years, although some children are diagnosed at older ages. Language delay or lack of appropriate social development may cause parents or teachers to seek an evaluation.