'Tip of the iceberg': how polio is making a comeback

It was largely eradicated almost 50 years ago, but the crippling disease polio is making a comeback.  The polio virus has been discovered in London, Jerusalem and New York state, where officials have declared a health emergency.  Today, the health commissioner from the US county where there are already hundreds of cases on what needs to be done to stop the worldwide spread.  Featured:  Dr Patricia Schnabel Ruppert, epidemiologist and health commissioner, Rockland County, New York