COVID-19 Data Repository by the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University (https://github.com/CSSEGISandData/COVID-19)
DATA SOURCES: This list includes a complete list of all sources ever used in the data set, since January 21, 2010. Some sources listed here (e.g., WHO, ECDC, US CDC, BNO News) are not currently relied upon as a source of data.
Aggregated data sources:
World Health Organization (WHO): https://www.who.int/ European Centre for Disease Prevention and Control (ECDC): https://www.ecdc.europa.eu/en/geographical-distribution-2019-ncov-cases DXY.cn. Pneumonia. 2020. http://3g.dxy.cn/newh5/view/pneumonia US CDC: https://www.cdc.gov/coronavirus/2019-ncov/index.html BNO News: https://bnonews.com/index.php/2020/02/the-latest-coronavirus-cases/ WorldoMeters: https://www.worldometers.info/coronavirus/ 1Point3Arces: https://coronavirus.1point3acres.com/en COVID Tracking Project: https://covidtracking.com/data. (US Testing and Hospitalization Data. We use the maximum reported value from "Currently" and "Cumulative" Hospitalized for our hospitalization number reported for each state.) Los Angeles Times: https://www.latimes.com/projects/california-coronavirus-cases-tracking-outbreak/ The Mercury News: https://www.mercurynews.com/tag/coronavirus/ US data sources at the state (Admin1) or county/city (Admin2) level:
Alaska Department of Health and Social Services: https://alaska-coronavirus-vaccine-outreach-alaska-dhss.hub.arcgis.com/ Washington State Department of Health: https://www.doh.wa.gov/emergencies/coronavirus Maryland Department of Health: https://coronavirus.maryland.gov/ New York State Department of Health: https://health.data.ny.gov/Health/New-York-State-Statewide-COVID-19-Testing/xdss-u53e/data New York City Health Department: https://www1.nyc.gov/site/doh/covid/covid-19-data.page NYC Department of Health and Mental Hygiene: https://www1.nyc.gov/site/doh/covid/covid-19-data.page and https://github.com/nychealth/coronavirus-data Florida Department of Health Dashboard: https://services1.arcgis.com/CY1LXxl9zlJeBuRZ/arcgis/rest/services/Florida_COVID19_Cases/FeatureServer/0 and https://fdoh.maps.arcgis.com/apps/opsdashboard/index.html#/8d0de33f260d444c852a615dc7837c86 Colorado: https://covid19.colorado.gov/covid-19-data Virginia: https://www.vdh.virginia.gov/coronavirus/ Northern Mariana Islands CNMI Department of Public Health: https://cnmichcc.maps.arcgis.com/apps/opsdashboard/index.html#/4061b674fc964efe84f7774b7979d2b5 Missouri Department of Health: https://www.arcgis.com/apps/MapSeries/index.html?appid=8e01a5d8d8bd4b4f85add006f9e14a9d Missouri: Nodaway County: https://www.nodawaypublichealth.org/ Missouri: St. Louis City Department of Health: https://www.stlouis-mo.gov/covid-19/data/#totalsByDate Missouri: St. Louis County: https://stlcorona.com/resources/covid-19-statistics1/ Massachusetts: https://www.mass.gov/info-details/covid-19-response-reporting Michigan: https://www.michigan.gov/coronavirus/0,9753,7-406-98163_98173---,00.html Illinois Department of Public Health: https://dph.illinois.gov/covid19 Indiana State Department of Health: https://hub.mph.in.gov/dataset?q=COVID Connecticut Department of Public Health: https://data.ct.gov/stories/s/COVID-19-data/wa3g-tfvc/ Ohio Department of Health: https://coronavirus.ohio.gov/wps/portal/gov/covid-19/home Oregon Health Authority: https://govstatus.egov.com/OR-OHA-COVID-19 Oregon Health Authority (Weekends): https://www.oregon.gov/oha/erd/pages/covid-19-news.aspx Tennessee Department of Health: https://www.tn.gov/health/cedep/ncov.html Rhode Island Department of Health: https://ri-department-of-health-covid-19-data-rihealth.hub.arcgis.com/ Wisconsin Department of Health Services: https://www.dhs.wisconsin.gov/covid-19/data.htm North Carolina City of Greenville GIS: https://www.arcgis.com/apps/opsdashboard/index.html#/7aeac695cafa4065ba1505b1cfa72747 Iowa State Government: https://coronavirus.iowa.gov/ Minnesota Department of Health: https://www.health.state.mn.us/diseases/coronavirus/situation.html Alabama Public Health: https://www.alabamapublichealth.gov/covid19/ Mississippi State Department of Health: https://msdh.ms.gov/msdhsite/_static/14,0,420.html Nebraska Department of Health and Human Services: https://experience.arcgis.com/experience/ece0db09da4d4ca68252c3967aa1e9dd South Carolina Department of Health and Environmental Control: https://scdhec.gov/infectious-diseases/viruses/coronavirus-disease-2019-covid-19/sc-testing-data-projections-covid-19 Nevada Department of Health and Human Services: https://nvhealthresponse.nv.gov/ New Jersey Department of Health: https://covid19.nj.gov/ Delaware Emergency Management Agency: https://coronavirus.delaware.gov/ Utah Department of Health: https://coronavirus-dashboard.utah.gov/#overview Arizona Emergency Support Function (ESF)/Recovery Support Function (RSF) Operations Dashboard: https://www.arcgis.com/apps/MapSeries/index.html?appid=62e6bfa682a34e6aae9d9255ac865467 Departamento de Salud, Puerto Rico: https://bioseguridad.maps.arcgis.com/apps/opsdashboard/index.html#/d7308c1abb4747e584329adf1215125e Arkansas Department of Health: https://experience.arcgis.com/experience/c2ef4a4fcbe5458fbf2e48a21e4fece9 Maine Department of Health and Human Services: https://www.maine.gov/dhhs/mecdc/infectious-disease/epi/airborne/coronavirus/data.shtml Pennsylvania Department of Health: https://www.health.pa.gov/topics/disease/coronavirus/Pages/Cases.aspx City of Philadelphia: https://www.phila.gov/programs/coronavirus-disease-2019-covid-19/ Lancaster County: https://covid-19-lancastercountypa.hub.arcgis.com/ Chester County: https://chesco.maps.arcgis.com/apps/opsdashboard/index.html#/975082d579454c3ca7877db0a44e61ca Louisiana Department of Health: http://ldh.la.gov/coronavirus/ Government of The District of Columbia: https://coronavirus.dc.gov/page/coronavirus-data North Dakota Department of Health: https://www.health.nd.gov/diseases-conditions/coronavirus/north-dakota-coronavirus-cases Oklahoma State Department of Health: https://looker-dashboards.ok.gov/embed/dashboards/44 Guam Department of Public Health and Social Services: http://dphss.guam.gov/covid-19/ New Mexico Department of Health: https://cvprovider.nmhealth.org/public-dashboard.html Kentucky Department of Public Health: https://kygeonet.maps.arcgis.com/apps/opsdashboard/index.html#/543ac64bc40445918cf8bc34dc40e334 Georgia Department of Public Health: https://dph.georgia.gov/covid-19-daily-status-report State of Hawai'i Department of Health: https://health.hawaii.gov/coronavirusdisease2019/what-you-should-know/current-situation-in-hawaii/ Reno County Health Department: http://reno.maps.arcgis.com/apps/opsdashboard/index.html#/dfaef27aede1414b89abf393b2ccb994 Texas Department of State Health Services: https://dshs.texas.gov/coronavirus/ Texas: City of San Antonio: https://covid19.sanantonio.gov/Home Texas: Brazioria County: https://www.brazoriacountytx.gov/departments/health-department/brazoria-county-coronavirus-map Texas: Brazos County Health District: http://www.brazoshealth.org Texas: Cameron County Public Health: https://www.cameroncounty.us/publichealth/index.php/coronavirus/ Texas: Collin County: https://www.collincountytx.gov/healthcare_services/Pages/news.aspx Texas: Dallas County: https://www.dallascounty.org/departments/dchhs/2019-novel-coronavirus.php Texas: Denton County: https://gis-covid19-dentoncounty.hub.arcgis.com/pages/covid-19cases Texas: Ector County: http://www.co.ector.tx.us/page/ector.CoronavirusCOVID19 Texas: City of El Paso: http://epstrong.org/results.php Texas: Fayette County: https://www.co.fayette.tx.us/ Texas: Fort Bend County Health & Human Services: https://www.fbchealth.org/ncov/ Texas: Galveston County Health District: https://www.gchd.org/about-us/news-and-events/coronavirus-disease-2019-covid-19/galveston-county-confirmed-covid-19-cases Texas: Harris County: https://publichealth.harriscountytx.gov/Resources/2019-Novel-Coronavirus Texas: Hays County: https://hayscountytx.com/covid-19-information-for-hays-county-residents/ Texas: Hidalgo County Health and Human Services: https://www.hidalgocounty.us/2630/Coronavirus-Updates Texas: Midland County: https://www.midlandtexas.gov/955/Coronavirus-COVID-19 Texas: Montgomery County: https://coronavirus-response-moco.hub.arcgis.com/ Texas: City of Corpus Christi: https://www.cctexas.com/coronavirus Texas: Amarillo Public Health Department: https://covid-data-amarillo.hub.arcgis.com/ Texas: Tarrant County Public Health: https://www.tarrantcounty.com/en/public-health/disease-control---prevention/coronaviruas.html Texas: City of Mount Pleasant: https://www.mpcity.net/632/COVID-19-UPDATES Texas: City of San Angelo: https://www.cosatx.us/departments-services/health-services/coronavirus-covid-19#ad-image-0 Texas: San Angelo Standard-Times: https://www.gosanangelo.com/ Texas: Travis County: https://www.traviscountytx.gov/news/2020/1945-novel-coronavirus-covid-19-information Texas: City of Laredo: https://www.cityoflaredo.com/coronavirus/ Texas: Williamson County & Cities Health District: http://www.wcchd.org/COVID-19/dashboard.php California Department of Publich Health: https://www.cdph.ca.gov/covid19 California: Mariposa County: https://www.mariposacounty.org/1592/COVID-19-Information California: Alameda County Public Health Department: https://covid-19.acgov.org/ California: Fresno County Public Health Department: https://www.co.fresno.ca.us/departments/public-health/covid-19 California: Humboldt County: https://humboldtgov.org/ California: Madera County: https://www.maderacounty.com/government/public-health/corona-virus-covid-19/covid-revised California: Marin County Health & Human Services: https://coronavirus.marinhhs.org/ California: Mendocino County: https://www.mendocinocounty.org/community/novel-coronavirus/covid-19-case-data California: Orange County Health Care Agency: https://occovid19.ochealthinfo.com/coronavirus-in-oc California: Placer County: https://www.placer.ca.gov/coronavirus California: Riverside County: https://www.rivcoph.org/coronavirus California: Sacramento County: https://www.saccounty.net/COVID-19/ California: San Francisco Department of Public Helath: https://www.sfdph.org/dph/alerts/coronavirus.asp California: San Benito County Health & Human Services: https://hhsa.cosb.us/publichealth/communicable-disease/coronavirus/ California: San Joaquin County Public Health Services: http://www.sjcphs.org/coronavirus.aspx California: San Mateo County: https://www.smchealth.org/coronavirus California: Santa Cruz County Health Services Agency: http://www.santacruzhealth.org/HSAHome/HSADivisions/PublicHealth/CommunicableDiseaseControl/CoronavirusHome.aspx California: Shasta County: https://www.co.shasta.ca.us/covid-19/overview California: Solano County: https://www.co.shasta.ca.us/covid-19/overview California: Sonoma County: https://socoemergency.org/emergency/novel-coronavirus/coronavirus-cases/ California: Stanislaus County Health Services Agency: http://schsa.org/publichealth/pages/corona-virus/ California: Ventura County: https://www.venturacountyrecovers.org/ California: Yolo County: https://www.yolocounty.org/health-human-services/adults/communicable-disease-investigation-and-control/novel-coronavirus-2019/ California: Los Angeles County: http://publichealth.lacounty.gov/media/coronavirus/ California: San Diego County: https://www.sandiegocounty.gov/coronavirus.html California: Santa Clara County: https://www.sccgov.org/sites/covid19/ California: Imperial County Public Health Department: http://www.icphd.org/health-information-and-resources/healthy-facts/covid-19/ California: San Bernardino County: https://sbcovid19.com/ Montana Department of Public Health and Human Services: https://dphhs.mt.gov/publichealth/cdepi/diseases/coronavirusmt South Dakota Department of Health: https://doh.sd.gov/news/coronavirus.aspx Wyoming Department of Health: https://health.wyo.gov/publichealth/infectious-disease-epidemiology-unit/disease/novel-coronavirus/ New Hampshire Department of Health and Human Services: https://www.nh.gov/covid19/dashboard/summary.htm Idaho Government: https://coronavirus.idaho.gov/ Virgin Islands Department of Health: https://www.covid19usvi.com/ Vermont Department of Health: https://www.healthvermont.gov/response/coronavirus-covid-19/current-activity-vermont Kansas: Reno County Health Department: https://experience.arcgis.com/experience/9a7d44773e4c4a48b3e09e4d8673961b/page/page_18/ Kansas: Kansas Department Of Health And Environment: https://www.coronavirus.kdheks.gov/160/COVID-19-in-Kansas Kansas: Douglas County Coronavirus Response and Recovery Hub: https://coronavirus-response-dgco.hub.arcgis.com/ Kansas: Finney County COVID-19 Resource Hub: https://finney-county-coronavirus-response-finneycountygis.hub.arcgis.com/ Kansas: Riley County Corona Virus Response: https://coronavirus-response-rcitgis.hub.arcgis.com/ Non-US data sources at the country/region (Admin0) or state/province (Admin1) level:
National Health Commission of the People’s Republic of China (NHC): http://www.nhc.gov.cn/xcs/yqtb/list_gzbd.shtml China CDC (CCDC): http://weekly.chinacdc.cn/news/TrackingtheEpidemic.htm Hong Kong Department of Health: https://www.chp.gov.hk/en/features/102465.html Macau Government: https://www.ssm.gov.mo/portal/ Taiwan CDC: https://sites.google.com/cdc.gov.tw/2019ncov/taiwan?authuser=0 Canada: Government of Canada: https://www.canada.ca/en/public-health/services/diseases/coronavirus.html Canada: Government of Alberta: https://www.alberta.ca/covid-19-alberta-data.aspx Canada: Government of British Columbia Centre for Disease Control: https://experience.arcgis.com/experience/a6f23959a8b14bfa989e3cda29297ded Canada: Government of Manitoba: https://www.gov.mb.ca/covid19/updates/cases.html Canada: Government of New Brunswick: https://experience.arcgis.com/experience/8eeb9a2052d641c996dba5de8f25a8aa Canada: Government of Newfoundland and Labrador: https://covid-19-newfoundland-and-labrador-gnl.hub.arcgis.com/ Canada: Government of Northwest Territories: https://www.gov.nt.ca/covid-19/ Canada: Government of Nova Scotia: https://novascotia.ca/coronavirus/data/ Canada: Nunavut Department of Health: https://www.gov.nu.ca/health/information/covid-19-novel-coronavirus Canada: Government of Ontario: https://covid-19.ontario.ca/data Canada: Grey Bruce Health Unit: https://www.publichealthgreybruce.on.ca/ Canada: Eastern Ontario Health Unit: https://eohu.ca/en/covid/covid-19-status-update-for-eohu-region Canada: Windsor-Essex County Health Unit: https://www.wechu.org/cv/local-updates Canada: Ottawa Public Health: https://www.ottawapublichealth.ca/en/reports-research-and-statistics/daily-covid19-dashboard.aspx Canada: York Region: https://www.york.ca/wps/portal/yorkhome/health/yr/covid-19/covid19inyorkregion/!ut/p/z1/tZPNcpswFIWfJQuWWBcJjOhOpa6BxNhN4j82HowxKAXkYMXUb1-R0pm20zjtJLAASZx7dPRxQRFaoaiKTzyLJRdVXKj5OhpufDb2Pe8agqlJXWAwZQG2KYwcAy2fBfDCxQBF_1J_QRBdtl-gCEWHhO_Q2qIWdYhj6U6Md7qJnVSnceLoO8PZOhhi9XbfqpNKHmSO1ud6k4hKppXU4Czqr2pylFw-PS_kokzVPY0LmWuQiBPf6YbTjQyHV21FnWYKEwpeO6SiiOuJO8lU1FjmOq_2Aq1-mnajP0xVDX94fIyYCtym_CbR6t0SL1sOv2Ye31ET_EVgs4UxBdMnnQBjc-gZLgTgTSn4n-2Z9Yl6BlzjTnDh0ygsWSG2P7qIVVtC1fnrdJ_WaT14qtVyLuXh-EEDDZqmGWRCZEU6SESpwd9KcnFUDH5XorXqH_tF9rcYLU88bdC8EnWpktz9Z7t40O1gU5d5bAwzuJ_b8GVkm3R4M5nd3Bpv3OGVA_RsT3q1t6Ffe9yv_fvACXxwDdb-Y2REgGHfpR9JQMOwX_Zhv-zDftmH_fb94q1wDuV8XlJiFQ9nAnxWLqmkzf0-z8rNZESsyw92dfUd1P5kcA!!/dz/d5/L2dBISEvZ0FBIS9nQSEh/#.X8UQBqpKi3U Canada: City of Toronto: https://www.toronto.ca/home/covid-19/covid-19-latest-city-of-toronto-news/covid-19-status-of-cases-in-toronto/ Canada: Region of Peel: https://peelregion.ca/coronavirus/case-status/ Canada: Halton Region: https://www.halton.ca/For-Residents/Immunizations-Preventable-Disease/Diseases-Infections/New-Coronavirus Canada: Government of Prince Edward Island: https://www.princeedwardisland.ca/en/information/health-and-wellness/pei-covid-19-case-data Canada: Government of Quebec: https://www.quebec.ca/en/health/health-issues/a-z/2019-coronavirus/situation-coronavirus-in-quebec/ Canada: Government of Saskatchewan: https://dashboard.saskatchewan.ca/health-wellness Canada: Government of Yukon: https://yukon.ca/en/case-counts-covid-19 Australia Government Department of Health: https://www.health.gov.au/news/coronavirus-update-at-a-glance COVID Live (Australia): https://www.covidlive.com.au/ Ministry of Health Singapore (MOH): https://www.moh.gov.sg/covid-19 Italy Ministry of Health: http://www.salute.gov.it/nuovocoronavirus Government of Ireland: https://covid19ireland-geohive.hub.arcgis.com/ Dati COVID-19 Italia (Italy): https://github.com/pcm-dpc/COVID-19/tree/master/dati-regioni Czechia Ministry of Health: https://onemocneni-aktualne.mzcr.cz/covid-19 French Government: https://dashboard.covid19.data.gouv.fr/ and https://www.data.gouv.fr/en/datasets/donnees-relatives-a-lepidemie-de-covid-19-en-france-vue-densemble/ OpenCOVID19 France: https://github.com/opencovid19-fr Palestine (West Bank and Gaza): https://corona.ps/details Israel: https://govextra.gov.il/ministry-of-health/corona/corona-virus/ Israel: https://datadashboard.health.gov.il/COVID-19/general National Institute of Health of Kosovo: https://corona-ks.info/?lang=en and https://raw.githubusercontent.com/bgeVam/Kosovo-Coronatracker-Data/master/data.json Berliner Morgenpost (Germany): https://interaktiv.morgenpost.de/corona-virus-karte-infektionen-deutschland-weltweit/ rtve (Spain): https://www.rtve.es/noticias/20200514/mapa-del-coronavirus-espana/2004681.shtml Ministry of Health, Republic of Serbia: https://covid19.rs/homepage-english/ Chile: https://www.minsal.cl/nuevo-coronavirus-2019-ncov/casos-confirmados-en-chile-covid-19/ Chile: https://www.gob.cl/coronavirus/cifrasoficiales/ Brazil Ministry of Health: https://covid.saude.gov.br/ Brazil: https://github.com/wcota/covid19br. Data described in DOI: 10.1590/SciELOPreprints.362 Belgium Sciensano: https://datastudio.google.com/embed/reporting/c14a5cfc-cab7-4812-848c-0369173148ab/page/giyUB Gobierono De Mexico:https://datos.covid-19.conacyt.mx/#DOView Japan COVID-19 Coronavirus Tracker: https://covid19japan.com/#all-prefectures Monitoreo del COVID-19 en Perú - Policía Nacional del Perú (PNP) - Dirección de Inteligencia (DIRIN): https://www.arcgis.com/apps/opsdashboard/index.html#/f90a7a87af2548699d6e7bb72f5547c2 and Ministerio de Salud del Perú: https://covid19.minsa.gob.pe/sala_situacional.asp Colombia National Institute of Health: http://www.ins.gov.co/Noticias/Paginas/Coronavirus.aspx Russia: https://xn--80aesfpebagmfblc0a.xn--p1ai/information/ Ukraine: https://covid19.rnbo.gov.ua/ Public Health Agency of Sweden: https://experience.arcgis.com/experience/09f821667ce64bf7be6f9f87457ed9aa Government of India: https://www.mygov.in/covid-19 Lithuania: https://osp.maps.arcgis.com/apps/MapSeries/index.html?appid=c6bc9659a00449239eb3bde062d23caa Government of Pakistan: http://covid.gov.pk/stats/pakistan The UK Government: https://coronavirus.data.gov.uk/#category=nations&map=rate Scottish Government: https://www.gov.scot/publications/coronavirus-covid-19-trends-in-daily-data/ Netherlands National Institute for Health and Environment: https://experience.arcgis.com/experience/ea064047519040469acb8da05c0f100d Iceland Directorate of Health and Department of Civil Protection and Emergency Management: https://www.covid.is/data Luxembourg Government: https://data.public.lu/fr/datasets/covid-19-rapports-journaliers/#_ Afghanistan: http://covid.moph-dw.org/#/ and http://www.afghanistantimes.af/ Kazakhstan: https://www.coronavirus2020.kz/ Republic of Turkey Ministry of Health: https://covid19.saglik.gov.tr/EN-69532/general-coronavirus-table.html Slovakia Ministry of Investment, Regional Development and Information: https://korona.gov.sk/
Covid Tracking Project Data Methodology (https://covidtracking.com/about-data/sources)
Almost all of the data we compile is taken directly from the websites of state/territory public health authorities. When data is missing from these websites, we sometimes supplement available numbers with information from official state social media accounts or from press conferences with governors or other state authorities.
Individual state/territory data pages such as Wyoming’s, all of which are accessible from our main data page, include a link at the top of the page to the “Data sources and screenshots” for that state as well as a link to the “Notes, data anomalies, and official cautions” page for that state.
Wyoming overview links
On the state’s sources and screenshots page, the “Primary” data source link is usually the state or territory’s public health department’s coronavirus-specific response page, and additional data sources are usually coronavirus-specific data dashboards or public health department web pages. We are careful to make sure that we collect data from official state/territory sources. We began capturing timestamped images of our data source pages on March 14, 2020, and these screenshots are also available on each state’s sources and screenshots page.
Wyoming sources and screenshots
We discuss anomalies, ambiguities, warnings, and methodological changes for each state’s data on each state’s notes page. If you notice anything odd about a state’s data, this is the first place to look for an explanation.
Wyoming notes page
As we note in our FAQ, there are several reasons why The COVID Tracking Project data might not match the visible data on a state’s dashboard, including the presence of hidden data that we retrieve with a machine query, different data definitions, and time lag.
To find the precise source of a particular data point, please refer to our public spreadsheet of source notes. Read our article ”How We Source Our Data and Why It Matters” for more information.
New York Times Data Methodology and Definitions (https://github.com/nytimes/covid-19-data)
The data is the product of dozens of journalists working across several time zones to monitor news conferences, analyze data releases and seek clarification from public officials on how they categorize cases.
It is also a response to a fragmented American public health system in which overwhelmed public servants at the state, county and territorial level have sometimes struggled to report information accurately, consistently and speedily. On several occasions, officials have corrected information hours or days after first reporting it. At times, cases have disappeared from a local government database, or officials have moved a patient first identified in one state or county to another, often with no explanation. In those instances, which have become more common as the number of cases has grown, our team has made every effort to update the data to reflect the most current, accurate information while ensuring that every known case is counted.
When the information is available, we count patients where they are being treated, not necessarily where they live.
In most instances, the process of recording cases has been straightforward. But because of the patchwork of reporting methods for this data across more than 50 state and territorial governments and hundreds of local health departments, our journalists sometimes had to make difficult interpretations about how to count and record cases.
For those reasons, our data will in some cases not exactly match with the information reported by states and counties. Those differences include these cases: When the federal government arranged flights to the United States for Americans exposed to the coronavirus in China and Japan, our team recorded those cases in the states where the patients subsequently were treated, even though local health departments generally did not. When a resident of Florida died in Los Angeles, we recorded her death as having occurred in California rather than Florida, though officials in Florida counted her case in their own records. And when officials in some states reported new cases without immediately identifying where the patients were being treated, we attempted to add information about their locations later, once it became available.
"Probable" and “Confirmed Cases and Deaths Cases and deaths can be reported as either “confirmed” or “probable.” Our total cases and deaths include both. The number of cases includes all cases, including those who have since recovered or died.
On April 5, the Council of State and Territorial Epidemiologists advised states to include both confirmed cases, based on confirmatory laboratory testing, and probable cases, based on specific criteria for testing, symptoms and exposure. The Centers for Disease Control adopted these definitions and national CDC data began including confirmed and probable cases on April 14.
Some governments continue to report only confirmed cases, while others are reporting both confirmed and probable numbers. And there is also another set of governments that is reporting the two types of numbers combined without providing a way to separate the confirmed from the probable.
The Geographic Exceptions section below has more details on specific areas. The methodology of individual states changes frequently.
Confirmed Cases Confirmed cases are counts of individuals whose coronavirus infections were confirmed by a laboratory test and reported by a federal, state, territorial or local government agency. Only tests that detect viral RNA in a sample are considered confirmatory. These are often called molecular or RT-PCR tests.
Probable Cases Probable cases count individuals who did not have a confirmed test but were evaluated by public health officials using criteria developed by states and the federal government and reported by a health department.
Public health officials consider laboratory, epidemiological, clinical and vital records evidence. Tests that detect antigens or antibodies are considered evidence towards a “probable” case, but are not sufficient on their own, according to the Council of State and Territorial Epidemiologists.
Confirmed Deaths Confirmed deaths are individuals who have died and meet the definition for a confirmed Covid-19 case. Some states reconcile these records with death certificates to remove deaths from their count where Covid-19 is not listed as the cause of death. We follow health departments in removing non-Covid-19 deaths among confirmed cases when we have information to unambiguously know the deaths were not due to Covid-19, i.e. in cases of homicide, suicide, car crash or drug overdose.
“Probable” Deaths Probable deaths are deaths where Covid-19 is listed on the death certificate as the cause of death or a significant contributing condition, but where there has been no positive confirmatory laboratory test.
Deaths among probable cases tracked by a state or local health department where a death certificate has not yet been filed may also be counted as a probable death.
For more on how states count confirmed and probable deaths, see this article.
Dates For each date, we show the cumulative number of confirmed cases and deaths as reported that day in that county or state. All cases and deaths are counted on the date they are first announced.
Each date includes all cases and deaths announced that day through midnight Eastern Time. As the West Coast and Hawaii tend to release all of their new data early enough in the day.
Declining Counts In some cases, the number of cases or deaths for a state or county will decline. This can occur when a state or county corrects an error in the number of cases or deaths they've reported in the past, or when a state moves cases from one county to another. When we are able, we will historically revise counts for all impacted dates. In other cases, this will be reflected in a single-day drop in the number of cases or deaths.
Counties In some instances, we report data from multiple counties or other non-county geographies as a single county. For instance, we report a single value for New York City, comprising the cases for New York, Kings, Queens, Bronx and Richmond Counties. In these instances the FIPS code field will be empty. (We may assign FIPS codes to these geographies in the future.) See the list of geographic exceptions.
Cities like St. Louis and Baltimore that are administered separately from an adjacent county of the same name are counted separately.
“Unknown” Counties Many state health departments choose to report cases separately when the patient’s county of residence is unknown or pending determination. In these instances, we record the county name as “Unknown.” As more information about these cases becomes available, the cumulative number of cases in “Unknown” counties may fluctuate.
Sometimes, cases are first reported in one county and then moved to another county. As a result, the cumulative number of cases may change for a given county.