methods to capture data for immunization registries and to move to a more comprehensive statewide system. To address concerns about both the shortages and the rising costs of vaccines, it will be important to explore the public policy tools available to create appropriate incentives for the production and distribution of vaccines. Also emphasized at the workshop is the special difficulty that public health and the immunization system face. These services can seem invisible when they work because people are not getting sick, but the public health system has suffered from neglect because of its invisibility. Leadership is needed to ensure that immunization issues remain visible and receive appropriate attention.