Cases of measles continue to grow in Pennsylvania, particularly in the southeastern and southcentral parts of the state.
The disease is highly contagious and known to linger in the air or on surfaces for up to two hours after an infected person leaves — leading to cases such as a recent warning of potential infections at a Lancaster County courthouse.
Measles was thought to be eliminated in the United States in 2000 due to an effective vaccine, delivered in two doses usually during early childhood. The MMR vaccine also inoculates against mumps and rubella…