Change Healthcare
Change Healthcare is a healthcare technology company that aggregates medical claims data from many healthcare providers. This source includes aggregated counts of claims with confirmed COVID-19 or COVID-related symptoms. All claims data has been de-identified in accordance with HIPAA privacy regulations.
Composite COVID Cases & Deaths
This source combines cases & deaths data from JHU and USA Facts, using JHU for Puerto Rico, and USA Facts everywhere else. It is not a primary source.
Covid Act Now (CAN)
COVID Act Now (CAN) tracks COVID-19 testing statistics, such as positivity rates and total tests performed. This source only includes CAN data from the CDC's COVID-19 Integrated County View.
COVID-19 Community Profile Report
This data source is based on the daily report published by the Data Strategy and Execution Workgroup under the White House COVID-19 Team, which contains detailed daily-resolution figures on cases, deaths, testing, hospital admissions, healthcare resources, and vaccinations.
Delphi US COVID-19 Trends and Impact Survey
We conduct the Delphi US COVID-19 Trends and Impact Survey (CTIS) in partnership with Facebook. Every day, Delphi surveys tens of thousands of Facebook users, asking them a broad set of COVID-related questions, including whether they, or anyone in their household, are currently experiencing COVID-related symptoms.
Doctor Visits From Claims
Information about outpatient visits, provided to us by health system partners. Using outpatient claims counts, we estimate the percentage of COVID-related doctor's visits in a given location, on a given day.
Google Health Trends
Google Health Trends tracks Google searches on health-related topics. This source includes Google Health Trends API results for overall searcher interest in a set of COVID-19 related terms about anosmia (lack of smell or taste), which emerged as a symptom of the coronavirus. No longer updated after March 8, 2021.
Google Symptom Surveys
Delphi ran symptom surveys using a Google tool which collects responses through publisher websites, Google's Opinions Reward app, and similar applications. No longer updated after May 15, 2020.
Google Symptoms Search Trends
Google's [COVID-19 Search Trends symptoms dataset](http://goo.gle/covid19symptomdataset) reflects the relative volume of Google searches for a broad set of symptoms, signs and health conditions. This source includes signals for 7 symptom sets: 6 sets of COVID-related symptoms, and 1 set of control symptoms unrelated to COVID-19. Because of the way this dataset is constructed, values are comparable across signals in the same location, but not across geographic regions, even within the same signal. Use caution in any geographic analyses.
Hospital Admissions From Claims
Information about hospital admissions, provided to us by health system partners. Using inpatient claim counts, we estimate the percentage of new hospital admissions with a COVID-associated diagnosis code in a given location, on a given day. See also our [Health & Human Services](https://cmu-delphi.github.io/delphi-epidata/api/covidcast-signals/hhs.html) data source for official COVID hospitalization reporting from the US Department of Health & Human Services.
Johns Hopkins University
Johns Hopkins University's Center for Systems Science and Engineering (JHU-CSSE) reports confirmed COVID-19 cases and deaths.
National Syndromic Surveillance Program
The National Syndromic Surveillance Program (NSSP) is an effort to track epidemiologically relevant conditions. This dataset in particular tracks emergency department (ED) visits arising from a subset of influenza-like illnesses, specifically influenza, COVID-19, and respiratory syncytial virus (RSV).
NCHS Mortality Data
This data source of national provisional death counts is based on death certificate data received and coded by the National Center for Health Statistics ([NCHS](https://www.cdc.gov/nchs/nvss/vsrr/COVID19/index.htm)). This data is different from the death data available from USAFacts and JHU CSSE: deaths are reported by the date they occur, not the date they are reported by local health departments, and data is frequently reissued as additional death certificates from recent weeks are received and tabulated.
Quidel Inc. (COVID)
Quidel, Inc. manufactures diagnostic equipment for healthcare applications, and provides Delphi with anonymized data on tests and test results. This source includes antigen tests for COVID-19.
Quidel Inc. (Flu)
Quidel, Inc. manufactures diagnostic equipment for healthcare applications, and provides Delphi with anonymized data on tests and test results. This source includes flu tests. No longer updated after May 19, 2020.
SafeGraph (Daily)
[SafeGraph](https://docs.safegraph.com/docs/social-distancing-metrics) compiles daily mobility information using anonymized location data from mobile phones. This source includes a range of isolation/lockdown behaviors and home dwell time. No longer updated after April 19, 2021.
SafeGraph (Weekly)
[SafeGraph](https://docs.safegraph.com/docs/weekly-patterns) compiles weekly insights on Points of Interest (POI) using anonymized location data from mobile phones. This source includes rates of restaurant and bar visits.
Statistical Combination (NMF)
This source provides signals which are statistical combinations of other sources, calculated by Delphi. It is not a primary data source. No longer updated after March 17, 2021.
U.S. Department of Health & Human Services
The US Department of Health & Human Services (HHS) publishes several datasets on patient impact and hospital capacity. This source includes only adult and pediatric hospital admissions with confirmed and suspected COVID-19 or confirmed influenza.
USAFacts
USAFacts is a nonprofit that aggregates and standardizes a vast array of data from US government agencies. This source reports confirmed COVID-19 cases and deaths.