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.

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

TABLE 1t. Weekly cases* of notifiable diseases, United States, U.S. Territories, and Non-U.S. Residents week ending December 18, 2021 (Week 50)
Reporting Area Invasive pneumococcal disease, age <5 years § Legionellosis
Confirmed Probable
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 4 21 417 475 1 2 23 22 21 340 6,665 5,673
New England - 2 18 22 - 1 1 - - 31 456 292
Connecticut - 1 6 4 - 0 - - - 8 85 79
Maine - 1 1 - - 0 - - - 5 35 11
Massachusetts - 1 10 14 - 1 1 - - 19 209 131
New Hampshire - 1 1 1 - 0 - - - 6 44 32
Rhode Island - 0 - 3 - 0 - - - 8 81 32
Vermont - 0 - - - 0 - - - 1 2 7
Middle Atlantic - 4 72 67 1 1 5 1 9 110 1,390 1,227
New Jersey - 3 17 18 1 1 3 - - 4 65 232
New York (excluding New York City) - 3 21 14 - 1 1 - 7 50 580 341
New York City - 3 14 12 - 1 1 - 2 23 357 316
Pennsylvania - 3 20 23 - 0 - 1 - 37 388 338
East North Central - 6 61 78 - 2 9 10 - 158 1,975 1,376
Illinois - 0 - - - 0 - - - 69 473 324
Indiana - 2 7 15 - 0 - - - 15 171 149
Michigan - 3 18 22 - 1 1 - - 46 401 363
Ohio - 3 28 28 - 2 8 10 - 122 807 305
Wisconsin - 3 8 13 - 0 - - - 13 123 235
West North Central - 2 25 34 - 1 2 6 2 17 268 310
Iowa N NC N N N NC N N - 3 39 31
Kansas - 0 - - - 0 - - - 5 41 50
Minnesota - 1 - 12 - 0 - - 2 9 123 94
Missouri - 2 18 16 - 1 1 4 - 3 18 104
Nebraska - 1 2 3 - 0 - - - 2 26 15
North Dakota - 1 1 - - 0 - - - 1 5 6
South Dakota - 1 4 3 - 1 1 2 - 2 16 10
South Atlantic 2 6 100 91 - 1 4 1 3 50 1,142 1,168
Delaware - 1 1 3 - 0 - - - 3 21 14
District of Columbia - 0 - 1 - 0 - - - 1 - 6
Florida 2 5 52 31 - 1 3 1 1 20 474 405
Georgia - 2 30 21 - 0 - - - 8 141 143
Maryland - 1 4 7 - 0 - - - 13 156 176
North Carolina N NC N N N NC N N - 11 118 123
South Carolina - 2 8 11 - 1 1 - 1 6 82 56
Virginia - 1 5 11 - 0 - - 1 10 144 197
West Virginia - 0 - 6 - 0 - - - 3 6 48
East South Central 1 4 46 43 - 0 - - - 20 320 304
Alabama - 2 14 12 - 0 - - - 6 86 57
Kentucky - 2 7 3 - 0 - - - 9 100 65
Mississippi - 2 16 11 - 0 - - - 1 3 33
Tennessee 1 2 9 17 - 0 - - - 12 131 149
West South Central 1 4 51 68 - 1 1 2 1 96 390 307
Arkansas - 2 15 12 - 0 - - 1 5 37 37
Louisiana - 3 12 18 - 0 - - - 5 53 45
Oklahoma - 0 - - - 0 - - - 26 1 -
Texas 1 3 24 38 - 1 1 2 - 67 299 225
Mountain - 3 38 67 - 1 1 2 4 14 312 258
Arizona - 2 16 19 - 0 - 1 2 5 99 87
Colorado - 0 - 18 - 0 - - 2 5 104 71
Idaho - 0 - - - 0 - - - 2 19 15
Montana - 0 - 2 - 0 - - - 1 9 7
Nevada - 1 6 7 - 0 - - - 2 22 25
New Mexico - 1 3 8 - 0 - - - 2 16 17
Utah - 1 12 13 - 1 1 1 - 3 38 31
Wyoming - 1 1 - - 0 - - - 1 5 5
Pacific - 2 6 5 - 0 - - 2 75 412 431
Alaska - 1 3 1 - 0 - - - 1 2 2
California N NC N N N NC N N 1 11 283 371
Hawaii - 1 3 4 - 0 - - - 1 8 14
Oregon N NC N N N NC N N 1 7 63 44
Washington N NC N N N NC N N - 68 56 -
U.S. Territories - 0 - - - 0 - - - 2 8 2
American Samoa N NC N N N NC N N N NC N N
Commonwealth of Northern Mariana Islands - 0 - - - 0 - - - 0 - -
Guam - 0 - - - 0 - - - 0 - -
Puerto Rico - 0 - - - 0 - - - 2 7 2
U.S. Virgin Islands - 0 - - - 0 - - - 1 1 -
Non-U.S. Residents - 0 - - - 0 - - - 1 2 -
Total 4 21 417 475 1 2 23 22 21 340 6,675 5,675
  • 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).
  • § Includes drug resistant and susceptible cases of Invasive Pneumococcal Disease.
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.