This issue of MMWR incorporates changes to Table I (Provisional cases of selected infrequently reported notifiable diseases [<1,000 cases reported during the preceding year], United States) and Table II (Provisional cases of selected notifiable diseases [>1,000 cases reported during the preceding year] and selected low frequency diseases, United States). This year, the Table I and Table II modifications add conditions designated or proposed as nationally notifiable by the Council of State and Territorial Epidemiologists (CSTE) and CDC (1–5). In addition, the presentation of viral hemorrhagic fevers data in Table I reflects recent enhancements made to the National Notifiable Diseases Surveillance System (NNDSS) to enable reporting jurisdictions to submit electronic case notifications for specific viral hemorrhagic fevers.