02/19/2012 07:02 am ET

The Doctors: What Pneumonia Is And When To Take Action

Punxsutawney Phil's prediction at the beginning of the month promised six more weeks of winter, a time you're most likely to be suffering with the sniffles. But at what point do you need to be concerned that your lingering cold could be developing into something worse? Watch as The Doctors explain exactly what pneumonia is, and when it makes sense to get the pneumonia vaccine.