Atlantic reports that Pennsylvania's Department of Health, along with three other states and the CDC, are combining Covid-19 detection tests with antibody tests in their testing reports. The former will reveal that you currently are currently are infected. The latter reveals whether you were infected previously.
Ashish Jha, Harvard Global Health Institute's Director, explains the difference. "“The viral testing is to understand how many people are getting infected, while antibody testing is like looking in the rearview mirror. The two tests are totally different signals.”
In Pa., Governor Tom Wolf is relying on this flawed data to determine when counties go from red to yellow.
In addition to The Atlantic report, Spotlight Pa is reporting that the state DOH's data from long term care facilities is also flawed, a point previously made by this blog.