An error occurred in this article by Morgan et al, titled “Vaccines Are Not Associated With Metabolic Events in Children With Urea Cycle Disorders” published in the May issue of Pediatrics (2011; vol 127: pages 1146–1153; Doi: 10.1542/peds.2010-1628). On page 1152, under the Acknowledgments heading the first line reads “The conduct of this study was funded by the Clinical Immunization and Safety Assessment Network through a subcontract with America's Health Insurance Plans under contract 200-2002-00732 from the Centers for Disease Control and Prevention.” This should have read: “The conduct of this study was funded by both the Clinical Immunization and Safety Assessment Network through a subcontract with America's Health Insurance Plans under contract 200-2002-00732 from the Centers for Disease Control and Prevention, and through the NIH Rare Disease Clinical Research Network Grants U54RR019453 and U54HD061221 through the Office of Rare Diseases.”

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