CDC reports how the data is actually collected and how its not complete and decisive

By Doug Wade

Data will update as soon as they are reviewed and verified, oftentimes before 8 pm ET. However, daily updates might be delayed due to delays in reported data.

On 4 February 2021, a state reported 1,507 new deaths. CDC is working with the state to assess the time period from which these data cover. This may temporarily impact death counts, rates and averages.

Data Sources, References & Notes: The case classifications for COVID-19, a nationally notifiable disease, are described in an an updated interim COVID-19 position statement and case definition issued by the Council of State and Territorial Epidemiologists on August 5, 2020 . However, there is some variation in how jurisdictions implement these case classifications. More information on how CDC collects COVID-19 case surveillance data can be found at CDC’s COVID-19 FAQ webpage.

Total cases are based on aggregate counts of COVID-19 cases reported by state and territorial jurisdictions to the Centers for Disease Control and Prevention (CDC) since January 21, 2020, with the exception of persons repatriated to the United States from Wuhan, China, and Japan. All displayed counts include confirmed COVID-19 cases and deaths as reported by U.S. states, U.S. territories, New York City (NYC), and the District of Columbia from the previous day. Counts for certain jurisdictions also include probable COVID-19 cases and deaths. Counts for NYC and New York State are shown separately; data for New York State show total cases and deaths for the state excluding data for NYC. COVID-19 case and death data that are not available to CDC are denoted by N/A. For aggregate state level data, CDC calculates the number of new cases or deaths each day by calculating the difference in cumulative counts reported by the state from the day before. Historical data are not typically updated unless requested by the state. Therefore, the number of historical cases and deaths presented on CDC’s website reflect the date the data was reported to CDC and not necessarily the date the case or death was recorded in the state.

The map can be modified to show cases and deaths per 100,000 people in the last 7 days, total new cases and deaths in the last 7 days, total cases and deaths since January 21, 2020, and rates for cases (cases/100,000 people) and deaths (deaths/100,000). The 7-day cumulative rate is calculated as (current day + 6 preceding days) per 100,000 people using the US Census Bureau, 2019* American Community Survey 1-year estimates. Rates per 100,000 are calculated as the total cases or deaths per 100,000 people using the US Census Bureau, 2019* American Community Survey 1-year estimates.

*2018 population estimates are still used for American Samoa, Federated States of Micronesia, Guam, New York City, Northern Mariana Islands, Palau, Republic of Marshall Islands and United States Virgin Islands.

CDC’s overall COVID-19 case and death numbers are validated through a confirmation process with each jurisdiction. COVID-19 case and death numbers reported on other websites may differ from what is posted on the CDC COVID Data Tracker due to the timing of reporting and COVID Data Tracker updates, which may differ by up to 24 hours. CDC COVID-19 counts from previous dates may be continually revised as more records are received and processed. Not all jurisdictions report counts daily; some counts are reported in batches and may increase COVID-19 case and death counts at different intervals and appear as spikes. The process used for finding and confirming COVID-19 cases and deaths displayed by other sites may differ.

On 18 December, Texas reported 171,505 historical counts of probable cases with dates between 1 November and 18 December. This raised the total number of new cases in both Texas and the U.S. during this time period and correspondingly affects the 7-day rolling average of new cases.

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