Pennsylvania Department of Health
                https://www.health.pa.gov/topics/disease/coronavirus/Pages/Cases.aspx

Centers for Disease Control COVID State-Level Data Tracker
               https://www.cdc.gov/covid-data-tracker/index.html#cases

Centers for Disease Control COVID County-Level Data Tracker
               https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/county-map.html

Harvard Global Health Institute County-level COVID Risk Levels
               https://globalepidemics.org/key-metrics-for-covid-suppression/

Johns Hopkins University COVID Dashboard
               https://coronavirus.jhu.edu/us-map

New York Times Coronavirus Vaccine Tracker
               https://www.nytimes.com/interactive/2020/science/coronavirus-vaccine-tracker.html

Tracing State-Level Responses to COVID-19

https://www.covidexitstrategy.org/

World Health Organization COVID tracker
             https://covid19.who.int/