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 1l. Weekly cases* of notifiable diseases, United States, U.S. Territories, and Non-U.S. Residents week ending December 11, 2021 (Week 49) column labels (in same order that data fields appears in each record below): Reporting Area Ehrlichiosis and Anaplasmosis, Ehrlichia ewingii infection; Current week Ehrlichiosis and Anaplasmosis, Ehrlichia ewingii infection; Previous 52 weeks Max † Ehrlichiosis and Anaplasmosis, Ehrlichia ewingii infection; Cum YTD 2021 † Ehrlichiosis and Anaplasmosis, Ehrlichia ewingii infection; Cum YTD 2020 † Ehrlichiosis and Anaplasmosis, Undetermined ehrlichiosis/anaplasmosis; Current week Ehrlichiosis and Anaplasmosis, Undetermined ehrlichiosis/anaplasmosis; Previous 52 weeks Max † Ehrlichiosis and Anaplasmosis, Undetermined ehrlichiosis/anaplasmosis; Cum YTD 2021 † Ehrlichiosis and Anaplasmosis, Undetermined ehrlichiosis/anaplasmosis; Cum YTD 2020 † Giardiasis; Current week Giardiasis; Previous 52 weeks Max † Giardiasis; Cum YTD 2021 † Giardiasis; Cum YTD 2020 † tab delimited data: U.S. Residents, excluding U.S. Territories - 2 8 18 - 13 116 50 116 325 9,163 8,778 New England - 0 - - - 2 5 2 9 31 689 641 Connecticut N NC N N N NC N N - 8 104 128 Maine - 0 - - - 0 - 2 1 8 131 136 Massachusetts - 0 - - - 2 4 - 8 17 333 264 New Hampshire - 0 - - - 1 1 - - 8 76 82 Rhode Island - 0 - - - 0 - - - 5 45 31 Vermont - 0 - - - 0 - - N NC N N Middle Atlantic - 2 3 3 - 11 84 5 47 81 2,354 1,903 New Jersey - 0 - 3 - 0 - - - 11 266 193 New York (excluding New York City) - 2 3 - - 1 7 4 29 45 870 714 New York City - 0 - - - 1 2 - 13 29 765 622 Pennsylvania - 0 - - - 11 75 1 5 22 453 374 East North Central - 1 2 3 - 2 15 13 4 60 1,067 1,228 Illinois - 0 - - - 1 1 1 N NC N N Indiana - 1 1 3 - 0 - - - 4 1 133 Michigan - 0 - - - 1 1 - - 14 314 355 Ohio - 0 - - - 0 - - - 44 292 268 Wisconsin - 1 1 - - 2 13 12 4 31 460 472 West North Central - 0 - 6 - 1 5 18 - 19 465 964 Iowa - 0 - - - 0 - - - 9 137 126 Kansas - 0 - - - 1 1 - - 8 75 100 Minnesota - 0 - - - 0 - - - 7 - 400 Missouri - 0 - 6 - 0 - 18 - 7 71 144 Nebraska - 0 - - - 0 - - - 4 77 77 North Dakota - 0 - - - 1 1 - - 4 40 55 South Dakota - 0 - - - 1 3 - - 8 65 62 South Atlantic - 1 1 4 - 1 4 6 3 42 1,258 1,283 Delaware - 0 - 1 - 0 - - - 2 28 23 District of Columbia - 0 - - - 0 - - - 1 4 23 Florida - 0 - 1 - 0 - - - 33 624 610 Georgia - 0 - - - 0 - - - 8 83 208 Maryland - 1 1 1 - 0 - - - 7 119 88 North Carolina - 0 - - - 0 - - N NC N N South Carolina - 0 - - - 1 3 6 - 8 135 105 Virginia - 0 - 1 - 0 - - 3 11 236 143 West Virginia - 0 - - - 1 1 - - 3 29 83 East South Central - 1 2 - - 1 1 2 1 7 150 121 Alabama - 0 - - - 0 - - 1 7 150 121 Kentucky - 1 1 - - 1 - 1 N NC N N Mississippi - 0 - - - 0 - - N NC N N Tennessee - 1 1 - - 1 1 1 N NC N N West South Central - 1 - 2 - 0 - - 7 21 327 232 Arkansas - 1 - 2 - 0 - - 7 10 132 73 Louisiana - 0 - - - 0 - - - 16 195 159 Oklahoma - 0 - - - 0 - - N NC N N Texas - 0 - - - 0 - - N NC N N Mountain - 0 - - - 0 - - 16 37 948 857 Arizona - 0 - - - 0 - - 3 8 71 80 Colorado N NC N N N NC N N 12 18 399 323 Idaho N NC N N N NC N N 1 6 114 109 Montana - 0 - - - 0 - - - 3 53 74 Nevada - 0 - - - 0 - - - 4 58 48 New Mexico N NC N N N NC N N - 3 26 45 Utah - 0 - - - 0 - - - 9 203 148 Wyoming - 0 - - - 0 - - - 2 24 30 Pacific - 0 - - - 1 2 4 29 200 1,905 1,549 Alaska N NC N N N NC N N - 6 57 85 California - 0 - - - 0 - 2 21 50 1,350 1,196 Hawaii N NC N N N NC N N - 2 19 26 Oregon - 0 - - - 1 2 2 7 14 314 242 Washington - 0 - - - 0 - - 1 184 165 - U.S. Territories - 0 - - - 0 - - - 2 20 40 American Samoa N NC N N N NC N N - 0 - - Commonwealth of Northern Mariana Islands - 0 - - - 0 - - - 1 - - Guam N NC N N N NC N N - 0 - 1 Puerto Rico N NC N N N NC N N - 2 20 39 U.S. Virgin Islands - 0 - - - 0 - - - 0 - - Non-U.S. Residents - 0 - - - 0 - - - 1 3 5 Total - 2 8 18 - 13 116 50 116 326 9,186 8,823 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). 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