Dr. Levine said the state is working to get antibody testing widespread in Pennsylvania. She said they do not quite know yet what antibody testing means in terms of infection rates, however. A recent study from California using antibody tests showed tens of thousands more people were actually positive for coronavirus. She said it is not a way to diagnose COVID-19 but is a way to track the infection. Dr. Levine said she wants to expand testing in the state even more through the public health laboratory, local hospitals and private labs.