* No measles cases were reported for the current 4-week period yielding a ratio for week 52 of zero (0).
† Ratio of current 4-week total to mean of 15 4-week totals (from previous, comparable, and subsequent 4-week periods for the past 5 years). The point where the hatched area begins is based on the mean and two standard deviations of these 4-week totals.
These are weekly cases of selected infectious
national notifiable 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.
Cases reported by state health departments to CDC for weekly publication are
subject to ongoing revision of information and delayed reporting.
Therefore, numbers listed in later weeks may reflect changes made to
these counts as additional information becomes available.
Case counts in the tables are presented as published each week.
Guide to Interpreting Provisional and Finalized NNDSS Data.
Weekly tables since 1996 are available on
Weekly tables for 1952-2017 published in the MMWR are available at CDC Stacks MMWR,
and weekly tables starting in 2018 are available at CDC Stacks NNDSS
(once in CDC Stacks NNDSS select "Weekly Tables" in the "Genre" box at the left).
The list of national notifiable infectious diseases and conditions and their national surveillance case definitions are
available at https://wwwn.cdc.gov/nndss/conditions/. This list incorporates the Council of State and Territorial
Epidemiologists (CSTE) position statements approved by CSTE for national surveillance.
Centers for Disease Control and Prevention. National Notifiable Diseases Surveillance System,
Weekly Tables of Infectious Disease Data. Atlanta, GA. CDC Division of Health Informatics and Surveillance.
Available at: https://wwwn.cdc.gov/nndss/infectious-tables.html.
CDC acknowledges the Local, State, and Territorial Health Departments that collected the data from a range of case ascertainment
sources (e.g., health-care providers, hospitals, laboratories) and reported these data to
CDC's National Notifiable Diseases Surveillance System.