DOI: 10.1542/peds.111.2.296 2003;111;296-301 Pediatrics Shinefield, Kenneth M. Zangwill, Joel I. Ward, S. Michael Marcy and Robert T. Chen Loren K. Mell, Robert L. Davis, John P. Mullooly, Steven B. Black, Henry R. Immunization Recommendations Polio Extraimmunization in Children Younger Than 2 Years After Changes in http://www.pediatrics.org/cgi/content/full/111/2/296 located on the World Wide Web at: The online version of this article, along with updated information and services, is rights reserved. Print ISSN: 0031-4005. Online ISSN: 1098-4275. Grove Village, Illinois, 60007. Copyright © 2003 by the American Academy of Pediatrics. All and trademarked by the American Academy of Pediatrics, 141 Northwest Point Boulevard, Elk publication, it has been published continuously since 1948. PEDIATRICS is owned, published, PEDIATRICS is the official journal of the American Academy of Pediatrics. A monthly at UNIV OF CHICAGO on December 9, 2007 www.pediatrics.org Downloaded from