Declines in U.S. cases and deaths that appear in the Coronavirus Resource Center’s data on Mondays are the result of several states and territories not reporting the information over the weekend. Those states and territories are: Alabama, Alaska, Connecticut, District of Columbia, Florida, Guam, Idaho, Kansas, Louisiana, Michigan, Mississippi, Montana, Nebraska, Nevada, New Mexico, North Carolina, Northern Mariana Islands, Oklahoma, Rhode Island, South Dakota, Tennessee, Vermont, Washington, West Virginia, Wisconsin, Wyoming, and Virgin Islands.
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On October 30, 2020, our data source for test data, the Covid Tracking Project, changed its definition of the contents of its totalTestResults field for Nebraska. We use this data for our positivity calculation denominator. This will will likely reduce the state's positivity percentage because people are deduplicated people less frequently, resulting in a bigger denominator.