In the twelfth episode of The CommonHealth Live! which falls during World Immunization Week, Katherine E. Bliss talks with Dr. Adam Ratner, a member of the American Academy of Pediatrics Committee on Infectious Diseases and author of Booster Shots: The Urgent Lessons of Measles and the Uncertain Future of Children's Health, and Dr. Ephrem T. Lemango, Associate Director of Immunization at UNICEF, about measles outbreaks in the United States and abroad; how to bolster measles vaccination coverage in a period of reduced financing for domestic and global programs; and why routine immunization programs are critical to global health security.