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Data Notes

General Notes

September 14, 2021

  • Reduced counts in U.S. cases and deaths are the result of states and territories not reporting the information for some or all of the weekend. Those states and territories are: Alaska, Colorado, Connecticut, District of Columbia, Florida, Georgia, Guam, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nebraska, Nevada, New Hampshire, New Mexico, North Carolina, Northern Mariana Islands, Oklahoma, Rhode Island, South Carolina, South Dakota, Tennessee, Utah, U.S. Virgin Islands, Virginia, Washington, West Virginia, Wisconsin, and Wyoming. Typically, these states" Monday updates include the weekend totals.

Region Notes

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May 18, 2021


  • Alabama reported that a recent spike in the number of total tests reported was caused by backlogs the state recently processed from two large facilities over the last three to four days. The surge in cases applies to past dates, not the state’s current situation. We will provide a clearer explanation as the state provides more information.

March 15, 2021


  • On March 15, 2021, the Alabama Department of Public Health (ADPH) posted a notice that they have processed a backlog of 4007 cases on 03/14/21. These will be classified as confirmed and probable COVID-19 cases reported on 03/15/21 even though the tests were performed on during October 1, 2020 through January 1, 2021. This will result in a case and positivity spike in the data.