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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 most of these sources is typically updated daily. You can use the covidcast_meta 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 endpoint documentation. Changes and corrections to data from this endpoint are listed in the 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 endpoint of the Delphi Epidata API. This code is open source and available on GitHub, and contributions are welcome.

COVIDcast Dashboard Signals

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

Kind Name Source Signal
Public Behavior People Wearing Masks fb-survey smoothed_wwearing_mask_7d
Public Behavior Vaccine Acceptance fb-survey smoothed_wcovid_vaccinated_appointment_or_accept
Public Behavior COVID Symptom Searches on Google google-symptoms sum_anosmia_ageusia_smoothed_search
Early Indicators COVID-Like Symptoms fb-survey smoothed_wcli
Early Indicators COVID-Like Symptoms in Community fb-survey smoothed_whh_cmnty_cli
Early Indicators COVID-Related Doctor Visits doctor-visits smoothed_adj_cli
Cases and Testing COVID Antigen Test Positivity (Quidel) quidel covid_ag_smoothed_pct_positive
Cases and Testing COVID Cases jhu-csse confirmed_7dav_incidence_prop
Late Indicators COVID Hospital Admissions hhs confirmed_admissions_covid_1d_prop_7dav
Late Indicators Deaths jhu-csse deaths_7dav_incidence_prop

All Available Sources and Signals

Beyond the signals available on the COVIDcast dashboard, numerous other signals are available through our data export tool or directly through the API:


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