CDC WONDER

CDC WONDER — Wide-ranging Online Data for Epidemiologic Research — is the CDC's public-data query system. It opens dozens of underlying datasets to interactive query: National Vital Statistics multiple-cause-of-death and natality, cancer-incidence data, AIDS public-use data, tuberculosis case data, vaccine adverse-event reporting (VAERS), environmental data and many more, returning population-adjusted rates, summary tables, charts and maps with confidence intervals.

For researchers it's often the fastest way to get a clean, ICD-coded U.S. statistic for a paper or grant; for journalists and policy analysts it's a primary source. Queries against very small subgroups are blocked or suppressed under disclosure-control rules.