Since the first case of the coronavirus was identified in Pennsylvania on March 6, we’ve been tracking its spread. These numbers tell only part of the story. Tests are still not widely available, and you can have the virus — and transmit it — without feeling sick. The numbers shown here represent known cases. Because of limited testing, undiagnosed cases are probably widespread. Every day, we are compiling data from multiple sources, including state and county health departments, to provide a more comprehensive picture of the coronavirus in the region.