COVID-Lab: Mapping COVID-19 in Your Community

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Test Positivity Rate & Case Counts by County

Pennsylvania Maps & Metrics

Projected Cases for 4 Weeks


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We measure social distancing as the percentage change in travel to non-essential businesses, as compared to normal activity before the pandemic. We calculate travel to non-essential businesses using cellphone GPS data from Unacast.

COVID-Lab: Mapping COVID-19 in Your Community was developed by an interdisciplinary team from Children’s Hospital of Philadelphia and the University of Pennsylvania, alongside global experts, and projects the COVID-19 epidemic across 820 counties with active outbreaks as it spreads across the United States, accounting for daily temperatures, social distancing and population density. The model now also includes case counts and test positivity rates for every county in the U.S. to help inform school reopening strategies. Confirmed and projected cases are shown for select counties, along with the reproduction number (R). For every COVID-19 case, R estimates the number of additional individuals infected. For more information on how we estimated R, see the desktop version of this feature.