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 25, 2021 (Week 51) 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 - 13 115 49 78 325 9,605 9,021 New England - 0 - - - 2 5 2 12 31 731 652 Connecticut N NC N N N NC N N - 8 104 131 Maine - 0 - - - 0 - 2 - 8 132 139 Massachusetts - 0 - - - 2 4 - 11 17 365 268 New Hampshire - 0 - - - 1 1 - - 8 76 83 Rhode Island - 0 - - - 0 - - 1 6 54 31 Vermont - 0 - - - 0 - - N NC N N Middle Atlantic - 2 3 3 - 11 83 5 21 81 2,424 1,974 New Jersey - 0 - 3 - 0 - - - 11 269 202 New York (excluding New York City) - 2 3 - - 1 6 4 17 45 907 737 New York City - 0 - - - 1 2 - 4 29 795 651 Pennsylvania - 0 - - - 11 75 1 - 22 453 384 East North Central - 1 2 3 - 2 15 13 3 60 1,096 1,250 Illinois - 0 - - - 1 1 1 N NC N N Indiana - 1 1 3 - 0 - - - 2 1 139 Michigan - 0 - - - 1 1 - 1 14 330 366 Ohio - 0 - - - 0 - - - 44 295 268 Wisconsin - 1 1 - - 2 13 12 2 31 470 477 West North Central - 0 - 6 - 1 5 18 1 20 601 994 Iowa - 0 - - - 0 - - - 9 152 137 Kansas - 0 - - - 1 1 - - 8 75 103 Minnesota - 0 - - - 0 - - - 7 - 407 Missouri - 0 - 6 - 0 - 18 1 8 186 148 Nebraska - 0 - - - 0 - - - 4 79 78 North Dakota - 0 - - - 1 1 - - 4 42 57 South Dakota - 0 - - - 1 3 - - 8 67 64 South Atlantic - 1 1 4 - 1 4 6 6 42 1,285 1,331 Delaware - 0 - 1 - 0 - - 1 2 30 23 District of Columbia - 0 - - - 0 - - - 1 4 23 Florida - 0 - 1 - 0 - - - 33 638 636 Georgia - 0 - - - 0 - - - 8 83 216 Maryland - 1 1 1 - 0 - - - 7 119 92 North Carolina - 0 - - - 0 - - N NC N N South Carolina - 0 - - - 1 3 6 1 8 136 112 Virginia - 0 - 1 - 0 - - 4 11 246 146 West Virginia - 0 - - - 1 1 - - 3 29 83 East South Central - 1 2 - - 1 1 2 2 7 158 128 Alabama - 0 - - - 0 - - 2 7 158 128 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 - - 4 21 336 246 Arkansas - 1 - 2 - 0 - - 4 10 138 80 Louisiana - 0 - - - 0 - - - 16 198 166 Oklahoma - 0 - - - 0 - - N NC N N Texas - 0 - - - 0 - - N NC N N Mountain - 0 - - - 0 - - 8 37 975 877 Arizona - 0 - - - 0 - - 1 8 74 81 Colorado N NC N N N NC N N 4 18 410 330 Idaho N NC N N N NC N N 1 6 120 112 Montana - 0 - - - 0 - - - 3 53 74 Nevada - 0 - - - 0 - - - 4 60 51 New Mexico N NC N N N NC N N - 3 26 45 Utah - 0 - - - 0 - - 2 9 208 152 Wyoming - 0 - - - 0 - - - 2 24 32 Pacific - 0 - - - 1 2 3 21 200 1,999 1,569 Alaska N NC N N N NC N N - 6 57 86 California - 0 - - - 0 - 1 14 51 1,426 1,210 Hawaii N NC N N N NC N N - 2 20 26 Oregon - 0 - - - 1 2 2 4 14 325 247 Washington - 0 - - - 0 - - 3 184 171 - U.S. Territories - 0 - - - 0 - - - 2 20 42 American Samoa N NC N N N NC N N - 0 - - Commonwealth of Northern Mariana Islands - 0 - - - 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 40 U.S. Virgin Islands - 0 - - - 0 - - - 0 - - Non-U.S. Residents - 0 - - - 0 - - - 1 3 5 Total - 2 8 18 - 13 115 49 78 326 9,628 9,068 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