Reported by: Mary G. McIntyre, MD, Kelly M. Stevens, MS, Sherri Davidson, MPH, Tina Pippin, Dagny Magill, MPH, Alabama Dept of Health. Julie A. Kulhanjian, MD, Children's Hospital and Research Center, Oakland; Daniel Kelly, MD, Pacific Pediatrics Medical Group, San Francisco; Tara L. Greenhow, MD, Kaiser Permanente, San Francisco; Maria L. Salas, MPH, Shigeo Yagi, PhD, Tasha Padilla, Ricardo Berumen, Carol Glaser, MD, California Dept of Public Health. Marie Louise Landry, MD, Jason Lott, MD, Yale New Haven Hospital, New Haven, Connecticut. Lei Chen, PhD, Susanne Paulson, Melissa Peek, Kathleen Hanley, Randall Todd, DrPH, Joseph Iser, MD, DrPH, Washoe County Health District, Reno, Nevada. Dianna M. Blau, DVM, PhD, Div of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases; Shannon Rogers, MS, Allan Nix, Steve Oberste, PhD, Lauren J. Stockman, MPH, Eileen Schneider, MD, Div of Viral Diseases, National Center for Immunization and Respiratory Diseases, CDC. Corresponding contributor: Lauren J. Stockman, firstname.lastname@example.org, 404-639-2553.