Notice: Improvements in data processing at CDC were applied to 2020 and 2021 data beginning with the tables published for week 47. Case count changes between tables published for week 46 and week 47 may be due to changes in data processing rules and not due to changes in disease levels.
Notice: Case counts for measles, mumps, pertussis, and rubella for week 49 of 2021 are erroneously elevated in some jurisdictions due to the inclusion of records that were classified as not a case.

Nationally Notifiable Infectious Diseases and Conditions, United States: Weekly Tables

TABLE 1z. Weekly cases* of notifiable diseases, United States, U.S. Territories, and Non-U.S. Residents week ending December 11, 2021 (Week 49)
Reporting Area Pertussis Plague Poliomyelitis, paralytic
Current weekPrevious 52 weeks Max †Cum YTD 2021 †Cum YTD 2020 †Current weekPrevious 52 weeks Max †Cum YTD 2021 †Cum YTD 2020 †Current weekPrevious 52 weeks Max †Cum YTD 2021 †Cum YTD 2020 †
U.S. Residents, excluding U.S. Territories 14 308 1,525 5,870 - 0 - 7 - 0 - -
New England 1 2 17 94 - 0 - - - 0 - -
Connecticut - 1 1 3 - 0 - - - 0 - -
Maine 1 2 11 30 - 0 - - - 0 - -
Massachusetts - 1 4 44 - 0 - - - 0 - -
New Hampshire - 1 1 4 - 0 - - - 0 - -
Rhode Island - 1 - 3 - 0 - - - 0 - -
Vermont - 1 - 10 - 0 - - - 0 - -
Middle Atlantic 2 15 224 726 - 0 - - - 0 - -
New Jersey - 2 16 131 - 0 - - - 0 - -
New York (excluding New York City) - 11 85 130 - 0 - - - 0 - -
New York City - 4 46 69 - 0 - - - 0 - -
Pennsylvania 2 6 77 396 - 0 - - - 0 - -
East North Central - 11 207 1,121 - 0 - - - 0 - -
Illinois - 4 36 352 - 0 - - - 0 - -
Indiana - 3 42 52 - 0 - - - 0 - -
Michigan - 4 27 123 - 0 - - - 0 - -
Ohio - 9 102 469 - 0 - - - 0 - -
Wisconsin - 0 - 125 - 0 - - - 0 - -
West North Central - 5 72 477 - 0 - - - 0 - -
Iowa - 4 16 30 - 0 - - - 0 - -
Kansas - 2 8 57 - 0 - - - 0 - -
Minnesota - 5 17 149 - 0 - - - 0 - -
Missouri - 1 6 129 - 0 - - - 0 - -
Nebraska - 2 13 60 - 0 - - - 0 - -
North Dakota - 4 12 17 - 0 - - - 0 - -
South Dakota - 0 - 35 - 0 - - - 0 - -
South Atlantic 4 12 202 845 - 0 - - - 0 - -
Delaware - 2 6 17 - 0 - - - 0 - -
District of Columbia - 2 4 10 - 0 - - - 0 - -
Florida 3 3 50 212 - 0 - - - 0 - -
Georgia - 4 33 175 - 0 - - - 0 - -
Maryland - 2 18 32 - 0 - - - 0 - -
North Carolina - 2 19 192 - 0 - - - 0 - -
South Carolina - 4 29 77 - 0 - - - 0 - -
Virginia 1 6 43 97 - 0 - - - 0 - -
West Virginia - 0 - 33 - 0 - - - 0 - -
East South Central 1 11 202 429 - 0 - - - 0 - -
Alabama - 10 129 261 - 0 - - - 0 - -
Kentucky - 3 27 64 - 0 - - - 0 - -
Mississippi - 1 7 10 - 0 - - - 0 - -
Tennessee 1 4 39 94 - 0 - - - 0 - -
West South Central 2 40 185 391 - 0 - - - 0 - -
Arkansas 2 2 14 35 - 0 - - - 0 - -
Louisiana - 5 23 33 - 0 - - - 0 - -
Oklahoma - 26 - - - 0 - - - 0 - -
Texas - 13 148 323 - 0 - - - 0 - -
Mountain 4 13 307 876 - 0 - 6 - 0 - -
Arizona 4 9 189 329 - 0 - 1 - 0 - -
Colorado - 1 - 124 - 0 - - - 0 - -
Idaho - 1 2 159 - 0 - 1 - 0 - -
Montana - 1 1 40 - 0 - - - 0 - -
Nevada - 4 18 15 - 0 - - - 0 - -
New Mexico - 3 27 62 - 0 - 4 - 0 - -
Utah - 5 70 135 - 0 - - - 0 - -
Wyoming - 0 - 12 - 0 - - - 0 - -
Pacific - 246 109 911 - 0 - 1 - 0 - -
Alaska - 1 1 13 - 0 - - - 0 - -
California - 6 82 711 - 0 - 1 - 0 - -
Hawaii - 1 4 17 - 0 - - - 0 - -
Oregon - 3 8 170 - 0 - - - 0 - -
Washington - 243 14 - - 0 - - - 0 - -
U.S. Territories - 1 - 37 - 0 - - - 0 - -
American Samoa - 0 - - - 0 - - - 0 - -
Commonwealth of Northern Mariana Islands - 0 - - - 0 - - - 0 - -
Guam - 0 - - - 0 - - - 0 - -
Puerto Rico - 1 - 37 - 0 - - - 0 - -
U.S. Virgin Islands - 0 - - - 0 - - - 0 - -
Non-U.S. Residents - 0 - - - 0 - - - 0 - -
Total 14 308 1,525 5,907 - 0 - 7 - 0 - -
  • U: Unavailable — The reporting jurisdiction was unable to send the data to CDC or CDC was unable to process the data.
  • -: No reported cases — The reporting jurisdiction did not submit any cases to CDC.
  • N: Not reportable — The disease or condition was not reportable by law, statute, or regulation in the reporting jurisdiction.
  • NN: Not nationally notifiable — This condition was not designated as being nationally notifiable.
  • NP: Nationally notifiable but not published.
  • NC: Not calculated — There is insufficient data available to support the calculation of this statistic.
  • Cum: Cumulative year-to-date counts.
  • Max: Maximum — Maximum case count during the previous 52 weeks.
  • * Case counts for reporting year 2021 are provisional and subject to change. Cases are assigned to the reporting jurisdiction submitting the case to NNDSS, if the case's country of usual residence is the U.S., a U.S. territory, unknown, or null (i.e. country not reported); otherwise, the case is assigned to the 'Non-U.S. Residents' category. Country of usual residence is currently not reported by all jurisdictions or for all conditions. For further information on interpretation of these data, see https://www.cdc.gov/nndss/docs/Readers-Guide-WONDER-Tables-20210421-508.pdf.
  • †Previous 52 week maximum and cumulative YTD are determined from periods of time when the condition was reportable in the jurisdiction (i.e., may be less than 52 weeks of data or incomplete YTD data).
Notes:
  • 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. See also Guide to Interpreting Provisional and Finalized NNDSS Data.
  • Weekly tables since 1996 are available on CDC WONDER.
  • Weekly tables since 2014 are available on Data.CDC.gov.
  • Weekly tables for 1952–2017 published in the Morbidity and Mortality Weekly Reports (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).
  • Notices, errata, and other notes are available in the Notice To Data Users page.
  • The list of national notifiable infectious diseases and conditions and their national surveillance case definitions are available at https://ndc.services.cdc.gov/. This list incorporates the Council of State and Territorial Epidemiologists (CSTE) position statements approved by CSTE for national surveillance.
Suggested Citation:
  • 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://www.cdc.gov/nndss/data-statistics/index.html.
Acknowledgment:
  • 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.