Weekly United States COVID-19 Cases and Deaths by County - ARCHIVED

<b>Note:</b> The cumulative case count for some counties (with small population) is higher than expected due to the inclusion of non-permanent residents in COVID-19 case counts. Reporting of Aggregate Case and Death Count data was discontinued on May 11, 2023, with the expiration of the COVID-19 public health emergency declaration. Although these data will continue to be publicly available, this dataset will no longer be updated. <b>Aggregate Data Collection Process Since the beginning of the COVID-19 pandemic, data were reported through a robust process with the following steps:</b><ul><li>Aggregate county-level counts were obtained indirectly, via automated overnight web collection, or directly, via a data submission process.</li><li>If more than one official county data source existed, CDC used a comprehensive data selection process comparing each official county data source to retrieve the highest case and death counts, unless otherwise specified by the state.</li><li>A CDC data team reviewed counts for congruency prior to integration. CDC routinely compiled these data and post the finalized information on COVID Data Tracker.</li><li>Cases and deaths are based on date of report and not on the date of symptom onset. CDC calculates rates in this data by using population estimates provided by the US Census Bureau Population Estimates Program (2019 Vintage).</li><li>COVID-19 aggregate case and death data were organized in a time series that includes cumulative number of cases and deaths as reported by a jurisdiction on a given date. New case and death counts were calculated as the week-to-week change in reported cumulative cases and deaths (i.e., newly reported cases and deaths = cumulative number of cases/deaths reported this week minus the cumulative total reported the week before.</li></ul> This process was collaborative, with CDC and jurisdictions working together to ensure the accuracy of COVID-19 case and death numbers. County counts provided the most up-to-date numbers on cases and deaths by report date. Throughout data collection, CDC retrospectively updated counts to correct known data quality issues. CDC also worked with jurisdictions after the end of the public health emergency declaration to finalize county data. <ul><li><b>Source:</b> The weekly archived dataset is based on county-level aggregate count data</li><li><b>Confirmed/Probable Cases/Death breakdown:</b> Cumulative cases and deaths for each county are included. Total reported cases include probable and confirmed cases.</li><li><b>Time Series Frequency:</b> The weekly archived dataset contains weekly time series data (i.e., one record per week per county)</li></ul> <b>Important note:</b> The counts reflected during a given time period in this dataset may not match the counts reflected for the same time period in the daily archived dataset noted above. Discrepancies may exist due to differences between county and state COVID-19 case surveillance and reconciliation efforts. The surveillance case definition for COVID-19, a nationally notifiable disease, was first described in a <a href="https://ndc.services.cdc.gov/case-definitions/coronavirus-disease-2019-covid-19/">position statement</a> from the Council for State and Territorial Epidemiologists, which was later <a href="https://ndc.services.cdc.gov/case-definitions/coronavirus-disease-2019-covid-19/">revised</a>. 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 <a href="https://www.cdc.gov/coronavirus/2019-ncov/covid-data/faq-surveillance.html">FAQ: COVID-19 Data and Surveillance</a>. <b>Confirmed and Probable Counts</b> In this dataset, counts by jurisdiction are not displayed by confirmed or probable status. Instead, counts of confirmed and probable cases and deaths are included in the Total Cases and Total Deaths columns, when available. Not all jurisdictions report

<b>备注：</b> 部分人口规模较小的县的累计新冠（COVID-19）确诊病例数高于预期，原因是新冠病例统计纳入了非永久居民。2023年5月11日，随着新冠疫情公共卫生紧急状态声明到期，聚合病例与死亡数数据的上报工作正式终止。尽管此类数据仍将对公众开放，但本数据集将不再进行更新。<b>聚合数据采集流程</b> 自新冠疫情暴发以来，数据通过一套规范流程进行上报，具体步骤如下：<ul><li>县级聚合数据通过两种方式获取：一是通过夜间自动网络爬虫间接获取，二是通过数据上报流程直接获取。</li><li>若存在多个官方县级数据源，美国疾病控制与预防中心（Centers for Disease Control and Prevention, CDC）将通过全面的数据筛选流程比对各官方数据源，以获取最高的病例与死亡数，除非州政府另有指定。</li><li>CDC的数据团队会在整合数据前核查数据的一致性。CDC会定期汇总此类数据，并将最终信息发布至COVID Data Tracker。</li><li>病例与死亡数以报告日期为准，而非症状出现日期。CDC在计算本数据集的发病率时，采用了美国人口普查局人口估计项目（2019年版）提供的人口估算数据。</li><li>新冠聚合病例与死亡数数据按时间序列组织，包含各辖区在指定日期上报的累计病例数与死亡数。新增病例与死亡数通过报告的累计病例数与死亡数的周度变化计算得出（即：新增上报病例/死亡数 = 本周上报的累计病例/死亡数 - 上周上报的累计总数）。</li></ul> 该流程为协作式流程，CDC与各辖区通力合作以确保新冠病例与死亡数的准确性。县级数据提供了按报告日期统计的最新病例与死亡数。在整个数据采集过程中，CDC会回溯更新数据以修正已知的数据质量问题。公共卫生紧急状态声明结束后，CDC还会同各辖区完成县级数据的最终定稿工作。<ul><li><b>数据来源：</b> 本每周存档数据集基于县级聚合计数数据</li><li><b>确诊/疑似病例及死亡数分类：</b> 本数据集包含各县级累计病例数与死亡数。上报的总病例数包含疑似病例与确诊病例。</li><li><b>时间序列频率：</b> 本每周存档数据集包含周度时间序列数据（即：每个县每周对应一条记录）</li></ul> <b>重要提示：</b> 本数据集某一特定时间段内的统计数据，可能与上述每日存档数据集同一时间段的统计数据不一致。这种差异可能源于县级与州级新冠病例监测及数据核对工作的差异。作为全国需上报的传染病，新冠的监测病例定义最初由美国国家与地区流行病学家理事会（Council for State and Territorial Epidemiologists）在一份<a href="https://ndc.services.cdc.gov/case-definitions/coronavirus-disease-2019-covid-19/">立场声明</a>中提出，之后又进行了<a href="https://ndc.services.cdc.gov/case-definitions/coronavirus-disease-2019-covid-19/">修订</a>。不过各辖区在实施此类病例分类时存在一定差异。如需了解CDC如何收集新冠病例监测数据的更多信息，可访问<a href="https://www.cdc.gov/coronavirus/2019-ncov/covid-data/faq-surveillance.html">常见问题解答：新冠数据与监测</a>。<b>确诊与疑似病例数</b> 本数据集未按确诊或疑似状态展示各辖区的统计数据。若有可用数据，确诊与疑似病例及死亡数会纳入「总病例数」与「总死亡数」列。并非所有辖区都会上报