L Mascola, MD, D Terashita, MD, Acute Communicable Disease Control, Los Angeles County Dept of Public Health; MB Salzman, MD, Kaiser Permanente West Los Angeles Medical Center; D Schnurr, PhD, S Yagi, T Padilla, Viral and Rickettsial Disease Laboratory, California Dept of Public Health. N Verma, MD, X Zheng, MD, PhD, ST Shulman, MD, Children's Memorial Hospital, Northwestern Univ Feinberg School of Medicine; MU Harris, MSN, Children's Memorial Hospital, Chicago, Illinois. R Gibson, MD, Maniilaq Health Center, Kotzebue; E Funk, MD, Alaska Dept of Health and Social Svcs; T Schmidt, MS, M Westcott, Alaska State Virology Laboratory. C Robinson, PhD, Children's Hospital, Aurora, Colorado. JP Burns, MD, JD, Dept of Pathology, Univ of New Mexico School of Medicine, Albuquerque; Scientific Laboratory Div, New Mexico Dept of Health. N Khetsuriani, MD, PhD, S Oberste, PhD, M Pallansch, PhD, A Fowlkes, MPH, M Wikswo, MPH, Div of Viral Diseases, National Center for Immunization and Respiratory Diseases; Div of Viral and Rickettsial Diseases, National Center for Zoonotic, Vector-Borne and Enteric Diseases; K Sircar, EIS Officer, CDC.