This graph of whooping cough cases in Washington State should scare…

The United States is in the middle of its worst whooping cough (aka pertussis) outbreak in over half a century, but few states have been hit as hard as Washington. This graph, released just a few days ago by the CDC, compares the state's pertussis cases in 2012 against those documented in 2011 — and the difference is… » 7/25/12 10:20am 7/25/12 10:20am