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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.

COVIDcast Map Signals

The following signals are currently displayed on the public COVIDcast map:

Kind Name Source Signal
Public Behavior Away from Home 6hr+ (SafeGraph) safegraph full_time_work_prop
Public Behavior Away from Home 3-6hr (SafeGraph) safegraph part_time_work_prop
Public Behavior Search Trends (Google) ght smoothed_search
Early Indicators Symptoms (Facebook) fb-survey smoothed_cli
Early Indicators Symptoms in Community (Facebook) fb-survey smoothed_hh_cmnty_cli
Early Indicators Doctor’s Visits doctor-visits smoothed_adj_cli
Early Indicators Combined indicator-combination nmf_day_doc_fbc_fbs_ght
Late Indicators Test Positivity Rate quidel covid_ag_smoothed_pct_positive
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
Late Indicators Hospital Admissions hospital-admissions smoothed_adj_covid19

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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