In 2015, an estimated 10% to 15% of U.S. parents didn’t follow the recommended vaccine schedules for children under 2. Now, a new study shows that at least one of their fears—that vaccines overload the immune system and increase susceptibility to other diseases—is unfounded.

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In 2015, an estimated 10% to 15% of U.S. parents didn’t follow the recommended vaccine schedules for children under 2. Now, a new study shows that at least one of their fears—that vaccines overload the immune system and increase susceptibility to other diseases—is unfounded.