The data shown in the N3C public health browser comes from the N3C Data Enclave,
the largest collection of real-world COVID-19 data in the USA. Data in the Enclave
comes from health care institutions, from 49/50 states in the USA,
and consists of rows of clinical information.
The Enclave also has an additional library of over 30 external data sets
varying in scope from mortality to pollution that can be linked to its real-world
clinical data. A full list of available external data sets can be found
In order to protect participant privacy, the data are de-identified and limited to aggregate counts and summary demographic information, with cell counts <20 not being displayed. For more information, please visit our FAQ page.