[link to delphi.cmu.edu (secure)
"Accessing Open COVID-19 Data via the COVIDcast Epidata API"
"Massive surveys we conduct through Facebook: Facebook has been sending a random sample of its users to Delphi’s symptoms and behavior survey every day since April 6. Our survey averages over 70,000 respondents each day"
"Massive surveys we run through Google: From April 11 to May 14, 2020, Delphi conducted a single-question symptoms survey through Google. It reached over 100,000 respondents daily during its short run, and was a surprisingly informative measure of pandemic activity preceding medical contact. "
"nsurance claims: Medical insurance claims include diagnostic codes, lab orders, and charge codes which can be used to estimate COVID-19 activity in a region. We have several partners who provide us with aggregated statistics from claims, or allow us to derive such statistics from strictly de-identified claim records. We use this data to construct signals reflecting COVID activity in both outpatient and inpatient visits"
"Quidel COVID antigen tests: Quidel is a national provider of networked lab testing devices, and began making de-identified records of their COVID-19 antigen tests available to us in early May. This data source fills an important gap because many public testing data sources only include PCR tests, not antigen tests"