Summary of Notifiable Diseases - United States, 1998 was published by the Centers for Disease Control (CDC) in the Morbidity and Mortality Weekly Report (MMWR) series as the official statistical record of reported cases of nationally notifiable diseases in the United States for 1998. Reported data come from the National Notifiable Diseases Surveillance System (NNDSS). Tables of reported cases of disease are presented by month, region and state, age group, race, and ethnicity. The report also includes tables of reported cases of notifiable diseases from previous years. Additionally, information on disease trends over time are provided by maps and graphs.