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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 13, 2022

Maryland

  • On May 12, 2022, Maryland posted 350 deaths for Dorchester County, and laterr corrected to 107 deaths. This caused a drop of 243 deaths.

April 8, 2022

Maryland

  • As of April 3, 2022, Maryland changed to once per week reporting (Fridays).

February 22, 2022

Maryland

January 5, 2022

Maryland

  • On December 28, 2021, Maryland reintroduced death data into its dataset. The reintroduction, without available metadata for a back distribution, have resulted in a spike of 417 deaths on that date.

December 20, 2021

Maryland

  • On December 20, 2021, Maryland began reporting case, deaths, and testing data again. Per the Maryland Department of Health website: As of 12/20/2021, 90 percent of state-level surveillance data for confirmed cases, persons tested negative, testing volume and positivity rate are restored. MDH continues to work to reinstate the full COVID-19 dataset and will resume reporting more surveillance information—including deaths and numbers by jurisdiction—as soon as possible.

December 15, 2021

Maryland

  • On December 5, 2021, Maryland's health department was struck by a cyberattack. This has resulted in a cessation of reporting on cases, deaths, and testing. Hospitalization and vaccine data continue to be updated.

December 1, 2021

Maryland

  • On Nov. 3, 2021, Maryland updated vaccination data submitted to the CDC that resulted in a decrease of 5,975 doses administered.