DescriptionCDC Wide-ranging ONline Data for Epidemiologic Research (CDC WONDER) is a public resource. This application makes many health-related data sets available to CDC staff, public health departments, researchers, and others. The data help with public health research, decision making, priority setting, program evaluation, and resource allocation. CDC WONDER manages nearly 20 collections of public-use data for U.S. births, deaths, cancer diagnoses, tuberculosis cases, vaccinations, environmental exposures, and population estimates, among many other topics. These data collections are available as online databases, which provide public access to ad-hoc queries, summary statistics, maps, charts, and data extracts. Most of the data are updated annually; some collections are updated monthly or weekly.