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.TABLE 1t. Weekly cases* of notifiable diseases, United States, U.S. Territories, and Non-U.S. Residents week ending December 18, 2021 (Week 50) column labels (in same order that data fields appears in each record below): Reporting Area Invasive pneumococcal disease, age <5 years §, Confirmed; Current week Invasive pneumococcal disease, age <5 years §, Confirmed; Previous 52 weeks Max † Invasive pneumococcal disease, age <5 years §, Confirmed; Cum YTD 2021 † Invasive pneumococcal disease, age <5 years §, Confirmed; Cum YTD 2020 † Invasive pneumococcal disease, age <5 years §, Probable; Current week Invasive pneumococcal disease, age <5 years §, Probable; Previous 52 weeks Max † Invasive pneumococcal disease, age <5 years §, Probable; Cum YTD 2021 † Invasive pneumococcal disease, age <5 years §, Probable; Cum YTD 2020 † Legionellosis; Current week Legionellosis; Previous 52 weeks Max † Legionellosis; Cum YTD 2021 † Legionellosis; Cum YTD 2020 † tab delimited data: 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. 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 https://www.cdc.gov/nndss/docs/Readers-Guide-WONDER-Tables-20210421-508.pdf, Guide to Interpreting Provisional and Finalized NNDSS Data. Weekly tables since 1996 are available on https://wonder.cdc.gov/nndss/nndss_weekly_tables_menu.asp, CDC WONDER. Weekly tables since 2014 are available on https://data.cdc.gov/browse?q=NNDSS&sortBy=newest&utf8=%E2%9C%93, Data.CDC.gov. Weekly tables for 1952–2017 published in the Morbidity and Mortality Weekly Reports (MMWR) are available at https://stacks.cdc.gov/mmwr, CDC Stacks MMWR, and weekly tables starting in 2018 are available at https://stacks.cdc.gov/nndss, 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 https://wonder.cdc.gov/nndss/NTR.html, 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/, 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, 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. https://www.cdc.gov/nndss/, National Notifiable Diseases Surveillance System Provided by https://wonder.cdc.gov, CDC WONDER