WILKES-BARRE, LUZERNE COUNTY (WBRE/WYOU) — If you test positive for COVID-19, health departments notify people you came into contact with at your work or school so they can quarantine and keep the virus from spreading even more. But a new app can extend contact tracing to anyone you walked by on the street or stood behind in line.

Tuesday Governor Tom Wolf and Secretary of Health Dr. Rachel Levine announced the launch of COVID Alert Pennsylvania. In the first day more than 30,000 Pennsylvanians started using the app and more than 16,000 checked in.