Pa. health chief says state is ‘doing well’ on contact tracing as counties reopen. But others fear we’re lagging

“We’re just not doing enough,” Dr. Ping Du, a professor of epidemiology at Penn State Hershey Medical Center, who argued that Pennsylvania wouldn’t be seeing an average of 960 new COVID-19 cases per day, as it has in the last week, if it had a robust system of tracers.