Provisional data for the National Notifiable Diseases Surveillance System (NNDSS) are published weekly in Morbidity and Mortality Weekly Report (MMWR) titled “Provisional cases of infrequently reported notifiable diseases, United States,” and “Provisional cases of selected notifiable diseases, United States.”
To provide timely NNDSS data, state and territorial health departments voluntarily report nationally notifiable diseases data to Centers for Disease Control and Prevention (CDC) as soon as possible after the criteria are met for submitting case notifications to CDC. These data include case reports that are considered to be “suspected” or “probable” as per published national condition-specific surveillance case definitions, in addition to those that are “confirmed.” Provisional NNDSS data are published each week in the MMWR to disseminate the most current national information but are subject to change based on the outcome of further case investigation. As provisional counts are updated, the cumulative (year-to-date) count of cases can increase or decrease. Year-to-date incidence data from the previous year are presented in the MMWR NNDSS Tables as a crude method to identify aberrations or discrepancies in reported disease data, whether because of disease incidence or reporting artifact.
This specific dataset shows provisional cases of selected national notifiable Acute Viral Hepatitis C diseases, from the National Notifiable Diseases Surveillance System (NNDSS). NNDSS data reported by the 50 states, New York City, the District of Columbia, and the U.S. territories are collated and published weekly as numbered tables printed in the back of the Morbidity and Mortality Weekly Report (MMWR). Cases reported by state health departments to CDC for weekly publication are provisional because of the ongoing revision of information and delayed reporting. Case counts in this table are presented as they were published in the MMWR issues. Therefore, numbers listed in later MMWR weeks may reflect changes made to these counts as additional information becomes available.
Footnotes: C.N.M.I.: Commonwealth of Northern Mariana Islands. U: Unavailable (No reported cases). N: Not reportable. NN: Not Nationally Notifiable. Cumulative: Cumulative year-to-date counts. Med: Median. Max: Maximum. Case counts for reporting years 2015 and 2016 are provisional and subject to change.