United States COVID-19 County Level of Community Transmission as Originally Posted - ARCHIVED

On October 20, 2022, CDC began retrieving aggregate case and death data from jurisdictional and state partners weekly instead of daily. This dataset contains archived community transmission and related data elements by county as originally displayed on the COVID Data Tracker. Although these data will continue to be publicly available, this dataset has not been updated since October 20, 2022. An archived dataset containing weekly community transmission data by county as originally posted can also be found here: <a href="https://data.cdc.gov/Public-Health-Surveillance/Weekly-COVID-19-County-Level-of-Community-Transmis/dt66-w6m6">Weekly COVID-19 County Level of Community Transmission as Originally Posted | Data | Centers for Disease Control and Prevention (cdc.gov)</a>.

<b>Related data</b>
CDC has been providing the public with two versions of COVID-19 county-level community transmission level data: this dataset with the daily values as originally posted on the COVID Data Tracker, and an historical dataset with daily data as well as the updates and corrections from state and local health departments. Similar to this dataset, the <a href="https://data.cdc.gov/Public-Health-Surveillance/United-States-COVID-19-County-Level-of-Community-T/nra9-vzzn">original historical dataset</a> is archived on 10/20/2022. It will continue to be publicly available but will no longer be updated. A new dataset containing historical community transmission data by county is now published weekly and can be found at: <a href="https://data.cdc.gov/dataset/Weekly-COVID-19-County-Level-of-Community-Transmis/jgk8-6dpn">Weekly COVID-19 County Level of Community Transmission Historical Changes | Data | Centers for Disease Control and Prevention (cdc.gov)</a>.

This public use dataset has 7 data elements reflecting community transmission levels for all available counties and jurisdictions. It contains reported daily transmission levels at the county level with the same values used to display transmission maps on the COVID Data Tracker. Each day, the dataset is appended to contain the most recent day's data. Transmission level is set to low, moderate, substantial, or high using the calculation rules below.

<b>Methods for calculating county level of community transmission indicator</b>
The County Level of Community Transmission indicator uses two metrics: (1) total new COVID-19 cases per 100,000 persons in the last 7 days and (2) percentage of positive SARS-CoV-2 diagnostic nucleic acid amplification tests (NAAT) in the last 7 days. For each of these metrics, CDC classifies transmission values as low, moderate, substantial, or high (below and <a href="https://www.cdc.gov/mmwr/volumes/70/wr/mm7030e2.htm?s_cid=mm7030e2_w#T1_down">here</a>). If the values for each of these two metrics differ (e.g., one indicates moderate and the other low), then the higher of the two should be used for decision-making.

<b>CDC core metrics of and thresholds for community transmission levels of SARS-CoV-2</b>

<b>Total New Case Rate Metric:</b> "New cases per 100,000 persons in the past 7 days" is calculated by adding the number of new cases in the county (or other administrative level) in the last 7 days divided by the population in the county (or other administrative level) and multiplying by 100,000. "New cases per 100,000 persons in the past 7 days" is considered to have a transmission level of Low (0-9.99); Moderate (10.00-49.99); Substantial (50.00-99.99); and High (greater than or equal to 100.00).

<b>Test Percent Positivity Metric:</b> "Percentage of positive NAAT in the past 7 days" is calculated by dividing the number of positive tests in the county (or other administrative level) during the last 7 days by the total number of tests conducted over the last 7 days. "Percentage of positive NAAT in the past 7 days" is considered to have a transmission level of Low (less than 5.00); Moderate (5.00-7.99); Substantial (8.00-9.99); and High (greater than or equal to 10.00).

If the two metrics suggest different transmission levels, the higher level is selected.

The reported transmission categories include:

Low Transmission Threshold: Counties with fewer than 10 total cases per 100,000 population in the past 7 days, and a NAAT percent test positivity in the past 7 days below 5%;

Moderate Transmission Threshold: Counties with 10-49 total cases per 100,000 population in the past 7 days or a NAAT test percent positivity in the past 7 days of 5.0-7.99%;

Substantial Transmission Threshold: Counties with 50-99 total cases per 100,000 population in the past 7 days or a NAAT test percent positivity in the past 7 days of 8.0-9.99%;

High Transmission Threshold: Counties with 100 or more total cases per 100,000 population in the past 7 days or a NAAT test percent positivity in the past 7 days of 10.0% or greater.

Blank: total new cases in the past 7 days are not reported (county data known to be unavailable) and the percentage of positive NAATs tests during the past 7 days (blank) are not reported.

<b>Data Suppression</b>
To prevent the release of data that could be used to identify people, data cells are suppressed for low frequency. When the <b>case counts</b> used to calculate the total new case rate metric ("cases_per_100K_7_day_count_change") is greater than zero and less than 10, this metric is set to "suppressed" to protect individual privacy. If the case count is 0, the total new case rate metric is still displayed.

The data in this dataset are considered provisional by CDC and are subject to change until the data are reconciled and verified with the state and territorial data providers. This dataset is created using <a href="https://www.cdc.gov/maso/policy/policy385.pdf">CDC’s Policy on Public Health Research and Nonresearch Data Management and Access</a>.

于2022年10月20日，美国疾病控制与预防中心（CDC）开始每周从辖区和州级合作伙伴处收集汇总的病例和死亡数据，而非每日收集。本数据集包含了社区传播及相关数据元素，按县别归档，原始数据可在COVID数据追踪器上查看。尽管这些数据将继续对外公开，但自2022年10月20日起，本数据集已不再更新。原始发布的按县别归档的每周社区传播数据集也可在此找到：[每周COVID-19县级行政区域社区传播水平原始发布 | 数据 | 美国疾病控制与预防中心（cdc.gov）](https://data.cdc.gov/Public-Health-Surveillance/Weekly-COVID-19-County-Level-of-Community-Transmis/dt66-w6m6)。

<b>相关数据</b>
CDC向公众提供两种COVID-19县级行政区域社区传播水平数据版本：本数据集包含原始发布于COVID数据追踪器上的每日数据，以及包含每日数据以及州和地方卫生部门更新和更正的历史数据集。与该数据集类似，原始历史数据集已于2022年10月20日归档。它将继续对外公开，但将不再更新。现在，一个新的包含按县别归档的每周社区传播历史数据的数据集已每周发布，并可在此找到：[每周COVID-19县级行政区域社区传播历史变化 | 数据 | 美国疾病控制与预防中心（cdc.gov）](https://data.cdc.gov/dataset/Weekly-COVID-19-County-Level-of-Community-Transmis/jgk8-6dpn)。

本公共使用数据集包含7个数据元素，反映了所有可用的县和辖区社区的传播水平。它包含县级别的每日传播水平报告，使用与COVID数据追踪器上显示的传播图相同的值。每天，数据集都会追加最新一天的数据。传播水平根据以下计算规则设置为低、中、高或极高。

<b>计算县级行政区域社区传播指标的方法</b>
县级行政区域社区传播指标使用两个指标：（1）过去7天每10万人中的新增COVID-19病例总数；（2）过去7天中SARS-CoV-2诊断性核酸扩增测试（NAAT）的阳性率百分比。对于这两个指标中的每一个，CDC将传播值分类为低、中、高（以下及<a href="https://www.cdc.gov/mmwr/volumes/70/wr/mm7030e2.htm?s_cid=mm7030e2_w#T1_down">以下</a>）。如果这两个指标中的值不同（例如，一个指标表明中，另一个指标为低），则应选择两者中的较高值用于决策。

<b>SARS-CoV-2社区传播水平CDC核心指标及阈值</b>

<b>新增病例率指标：</b>“过去7天每10万人中的新增病例数”是通过将县（或其他行政级别）过去7天的新增病例数除以县（或其他行政级别）的人口数，然后乘以100,000来计算的。“过去7天每10万人中的新增病例数”被认为具有低（0-9.99）；中（10.00-49.99）；高（50.00-99.99）；和极高（等于或大于100.00）的传播水平。

<b>测试阳性率指标：</b>“过去7天NAAT阳性率百分比”是通过将县（或其他行政级别）过去7天进行的总测试中阳性测试数除以过去7天进行的总测试数来计算的。“过去7天NAAT阳性率百分比”被认为具有低（小于5.00）；中（5.00-7.99）；高（8.00-9.99）；和极高（等于或大于10.00）的传播水平。如果这两个指标表明不同的传播水平，则选择较高的水平。

报告的传播类别包括：
低传播阈值：过去7天内每10万人中总病例数少于10例，以及过去7天内NAAT阳性测试率低于5%；
中传播阈值：过去7天内每10万人中总病例数为10-49例或过去7天内NAAT测试阳性率为5.0-7.99%；
高传播阈值：过去7天内每10万人中总病例数为50-99例或过去7天内NAAT测试阳性率为8.0-9.99%；
极高传播阈值：过去7天内每10万人中总病例数为100例或以上或过去7天内NAAT测试阳性率为10.0%或更高。
空白：过去7天内未报告总新增病例数（已知县数据不可用）和过去7天内NAAT阳性测试率的百分比（空白）。

<b>数据压制</b>
为防止发布可能被用于识别个人的数据，当用于计算总新增病例率指标的病例数（“cases_per_100K_7_day_count_change”）大于零且小于10时，此指标被设置为“压制”，以保护个人隐私。如果病例数为0，则总新增病例率指标仍会显示。
本数据集的数据被视为由CDC确定的临时数据，并在与州和地区数据提供者核实和验证之前可能发生变化。本数据集是根据<a href="https://www.cdc.gov/maso/policy/policy385.pdf">CDC公共卫生研究和非研究数据管理和访问政策</a>创建的。