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.
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As of January 11, 2022, Alaska no longer provides county-level testing data.
Per the CDC, on December 23, 2021, West Virginia made updates to data previously submitted to CDC that resulted in a decrease of 651,436 doses administered.
During the week of January 4, 2022, the Minnesota Department of Health identified an issue that caused COVID-19 PCR test results from certain labs not to be processed into its surveillance system. The issue caused a delay in about 135,000 test results being loaded into its system from December 28, 2021 to January 3, 2022. The issue has been fixed and the Minnesota Department of Health is working on reviewing all the delayed positive test results. Cases from these tests will be included in its data in the coming days.
Starting January 5, 2022, Tennessee's daily COVID-19 data reports will shift to weekly data reports. Data reported on Wednesdays will contain data for the previous Sunday to Saturday. https://twitter.com/TNDeptofHealth/status/1478850048662413320
On January 1, 2022, the JHU CRC's source for Alabama was stale due to maintenance.
Georgia did not report data from January 1 - January 3, 2022, due to an "overwhelming" amount of data. The data reported on January 4, 2022, includes data from January 1 through January 4. A screenshot of their announcement may be found here: https://github.com/CSSEGISandData/COVID-19/issues/5142
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.
On December 23, 2021, Tennessee updated deaths data after reviewing death certificates. This resulted in an increase of 2,172 deaths, which cannot be back-distributed as the state does not have metadata that will allow for it.
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.
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.