P Lurie, MD, Div of Infectious Disease Epidemiology; H Stafford, P Tran,
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DVM, T Tiwari, MD, T Murphy, MD, J Moran, MD, Epidemiology and Surveillance
Div, National Immunization Program; P Cassiday, MS, Div of Bacterial and Mycotic
Diseases, National Center for Infectious Diseases, CDC.