- The theme of this year's World Immunization Week is Close the Immunization Gap
- 1.5 million children around the world don't receive the life-saving vaccines they need
- New approaches to old problems are yielding fresh tools to fight vaccine-preventable diseases
Dr. Orin Levine is director of vaccine delivery at the Bill & Melinda Gates Foundation.
(CNN)One of the things I like most about spring is that my 52-week-a-year job gets extra attention for one full week: World Immunization Week.