Sonja A. Rasmussen, MD, MS, was the Director of CDC's Division of Public Health Information Dissemination in the Center for Surveillance, Epidemiology, and Laboratory Services (CSELS) and Editor-in-Chief of the Morbidity and Mortality Weekly Report (MMWR) Series while serving as the editor of this book. She is currently CDC's Deputy Director for Infectious Diseases and Director of CDC's Office of Infectious Diseases. She has held leadership positions in several CDC emergency responses, including 2009 H1N1 influenza, Middle East Respiratory Syndrome (MERS) Coronavirus, and Ebola and Zika viruses. Richard A. Goodman, MD, JD, MPH, is Professor of Medicine at Emory University's School of Medicine and Rollins School of Public Health. Dr. Goodman held leadership and senior staff positions at the Centers for Disease Control and Prevention from 1978 to 2015, serving as Editor-in-Chief of CDC's Morbidity and Mortality Weekly Report (MMWR) Series for a decade, Co-Director of CDC's Public Health Law Program, and Associate Director of CDC's Epidemiology Program Office. The Centers for Disease Control and Prevention (CDC), headquartered in Atlanta, Georgia, is a United States federal agency under the Department of Health and Human Services.