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Delphi’s COVID-19 Data Sources and Signals

Delphi’s COVID-19 Surveillance Streams data includes the following data sources. Data from these sources is expected to be updated daily. You can use the covidcast_meta API endpoint to get summary information about the ranges of the different attributes for the different data sources.

The API for retrieving data from these sources is described in the COVIDcast API endpoint documentation. Changes and corrections to data in this API are listed in the API changelog.

To obtain many of these signals and update them daily, Delphi has written extensive software to obtain data from various sources, aggregate the data, calculate statistical estimates, and format the data to be shared through the COVIDcast API. This code is open source and available on GitHub, and contributions are welcome.

COVIDcast Map Signals

The following signals are currently displayed on the public COVIDcast map and available in its data export tool:

Kind Name Source Signal
Public Behavior At Away Location 6hr+ safegraph full_time_work_prop_7dav
Public Behavior At Away Location 3-6hr safegraph part_time_work_prop_7dav
Public Behavior Bar Visits safegraph bars_visit_prop
Public Behavior Restaurant Visits safegraph restaurant_visit_prop
Public Behavior People Wearing Masks fb-survey smoothed_wearing_mask_7d
Public Behavior Vaccine Acceptance fb-survey smoothed_covid_vaccinated_or_accept
Public Behavior COVID Symptom Searches on Google google-symptoms sum_anosmia_ageusia_smoothed_search
Early Indicators COVID-Related Doctor Visits doctor-visits smoothed_adj_cli
Early Indicators COVID-Like Symptoms fb-survey smoothed_cli
Early Indicators COVID-Like Symptoms in Community fb-survey smoothed_hh_cmnty_cli
Late Indicators COVID Antigen Test Positivity (Quidel) quidel covid_ag_smoothed_pct_positive
Late Indicators Claims-Based COVID Hospital Admissions hospital-admissions smoothed_adj_covid19_from_claims
Late Indicators Cases indicator-combination confirmed_7dav_incidence_num
Late Indicators Cases per 100,000 People indicator-combination confirmed_7dav_incidence_prop
Late Indicators Deaths indicator-combination deaths_7dav_incidence_num
Late Indicators Deaths per 100,000 People indicator-combination deaths_7dav_incidence_prop

All Available Sources and Signals

Beyond the signals available on the COVIDcast map, numerous other signals are available directly through the API:


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