Cynthia Rand, MD, MPH¹, Aaron Blumkin, MS¹, Stanley Schaffer, MD, MS¹, Allison Kennedy, MPH², Phyllis Vincelli, BA¹, Nora Peters, BA¹ and Jonathan Klein, MD, MPH³, 1Department of Pediatrics, University of Rochester Medical Center, Rochester, NY, 2NCIRD/Immunization Services Division, CDC-NCIRD, Atlanta, GA, 3American Academy of Pediatrics