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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.


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January 24, 2023

Colorado

  • Colorado shows gaps in reporting on January 17, 2023 and January 19, 2023. We are investigating whether these gaps were one-off interruptions or changes to reporting cadence.

Illinois

  • Illinois" stated update frequency for the state dashboard is “Data is updated on weekdays, Monday-Friday, either daily or weekly. Data is not updated on weekends or holidays.” The reporting since the New Year has not adhered to this reporting schedule, with a gap in reporting from January 5, 2023 - January 17, 2023. As of January 24, 2023, there have been no updates since January18, 2023.

Maine

  • Maine reported 51 deaths from January 10 - January 14, 2023, but only one death from January 17 - January 21, 2023. The reason for the decrease is unclear, but our data collection matches the headline numbers published by the Maine Department of Health.

Mississippi

  • Mississippi did not report during the week of January 8 - January 14, 2023.

North Carolina

Virginia

  • Virginia's reported deaths in the past two weeks are substantially higher than recent trends. We have been unable to use publicly available information to confirm that this surge is due to death certificate review or backlogged deaths.

January 12, 2023

Indiana

  • On January 11, 2023, we were able to back-distribute case data for Indiana for the period from December 14 to the present. A gap in reporting for that period was a result of changes to the source's dashboard. We have also adjusted our sourcing to pull from their new dashboard.

Vermont

December 20, 2022

China

  • China’s COVID-19 cases on the Johns Hopkins Coronavirus Resource Center may appear to decline significantly after Dec. 14, 2022 due to the nation’s decision to stop reporting infections that it calls “asymptomatic.”

    The National Health Commission of the People's Republic of China stated in a Dec. 14 online daily briefing that “it’s impossible to get accurate statistics for asymptomatic cases given the fact that many asymptomatic cases choose not to take nucleic acid tests,” which are voluntary.

    “Therefore, starting from Dec 14, 2022, statistics for asymptomatic cases will no longer be released,” the Chinese government announced.

    China defines asymptomatic cases as those that register positive results but that are not accompanied by COVID-19's most common symptoms.

    The Coronavirus Resource Center has notified its data users about the Dec. 14 decision to cease reporting asymptomatic cases just as it notified them of China’s decision earlier this year to start reporting such infections.

    When China released asymptomatic data in March 2022, Johns Hopkins researchers added the newly reported cases across daily reports dating back to March 2020.

    The CRC stopped reporting asymptomatic cases in China's daily reports on Dec. 14. But the total number of asymptomatic cases that China has reported – 1,521,800 – will remain part of the nation’s cumulative total number of cases.

December 19, 2022

Georgia

  • On December 7, 2022, Georgia did not update, but then updated on December 8, 2022. The state normally updates once per week on Wednesdays.