(Bloomberg) Autism risk isn’t increased by the use of recommended childhood vaccines, U.S. health officials found in a study addressing parent concerns that too many immunizations may cause the disorder.

An analysis of 1,000 toddlers showed no differences in exposures to vaccines between autistic and normally-developing children, according to findings published in the Journal of Pediatrics by researchers at the Centers for Disease Control and Prevention in Atlanta. The CDC recommends 10 immunizations before age 2, and some require more than one shot.

Multiple studies have shown measles, mumps and rubella vaccines don’t individually cause autism. A third of parents surveyed in a previous report were concerned too many vaccines given before age 2, or on the same visit, may be a contributor. About 1 in 10 toddler parents refuse or delay vaccinations because they believe the schedule to be unsafe, the study said.

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