Link Search Menu Expand Document

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:

Kind Name Source Signal
Public Behavior Away from Home 6hr+ a Day safegraph full_time_work_prop
Public Behavior Away from Home 3-6hr a Day safegraph part_time_work_prop
Public Behavior COVID Searches on Google ght smoothed_search
Early Indicators COVID-Like Symptoms fb-survey smoothed_cli
Early Indicators COVID-Like Symptoms in Community fb-survey smoothed_hh_cmnty_cli
Early Indicators COVID-Related Doctor Visits doctor-visits smoothed_adj_cli
Early Indicators COVID Indicator Combination indicator-combination nmf_day_doc_fbc_fbs_ght
Late Indicators COVID Antigen Test Positivity (Quidel) quidel covid_ag_smoothed_pct_positive
Late Indicators 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:

Table of contents