Vaccines can be credited for saving more lives and preventing more illnesses than any other medical treatment. However, each year nearly one million American children under age two remain unprotected against life-threatening yet preventable childhood diseases because they are not fully immunized. Making sure that children are vaccinated is critical to protecting their health and preventing disease outbreaks. Local health departments (LHDs) play a crucial role in ensuring that children, adolescents, and adults are vaccinated according to recommended schedules. NACCHO's 2000 Local Public Health Agency Infrastructure survey reported that 74 percent of LHDs provide childhood immunizations. NACCHO's Board of Directors ranked immunization as one of the organization’s top priorities.