Only one Pennsylvania county is demonstrating substantial spread of COVID-19, Gov. Tom Wolf’s office said Tuesday. Wyoming County is the only county in the commonwealth with high transmission of the coronavirus, according to Wolf’s office. The number of counties with high transmission has dropped dramatically in recent weeks. Last week, five counties showed substantial spread of the coronavirus, Wolf’s office said. Just three weeks ago, 40 of the state’s 67 counties were still showing substantial transmission. The percentage of positive COVID-19 tests dropped to 3.8% for the week of May 21-27, down from 4.5% the previous week. It’s the sixth...