COVID-19 Testing Group

The COVID-19 Testing Group is a community resource for sharing the latest information on COVID-19 prevalence, seroprevalence, and burden studies, planning tools, and data. This website is maintained jointly by the Larremore Lab at the University of Colorado, Boulder and the Grad Lab at the Harvard T.H. Chan School of Public Health.

Prevalence calculator (known sensitivity and specificity)

This calculator is one of multiple resources available through the COVID-19 Testing Group. It accompanies the manuscript "Estimating SARS-CoV-2 seroprevalence and epidemiological parameters with uncertainty from serological surveys", which is available as a preprint. This work is not yet peer reviewed.
Given test results in a population sample, using a test with known sensitivity and specificity, what is the posterior distribution of prevalence in the population?
# positive tests
# negative tests

This is in beta. Please report bugs with screenshots to The source code for this visualization is on Github.