A follow-up to the last post

From Kids Health by the Nemours Foundation:

"Will the immunization give my child the very disease it's supposed to prevent?

This is one of parents' most common concerns about vaccines. However, it's impossible to get the disease from any vaccine made with dead (killed) bacteria or viruses or just part of the bacteria or virus.

Only those immunizations made from weakened (also called attenuated) live viruses - like the chickenpox (varicella) or measles-mumps-rubella (MMR) vaccine - could possibly make a child develop a mild form of the disease, but it's almost always much less severe than the illness that occurs when a person is infected with the disease-causing virus itself."