Mumps and the value of vaccines — Opinion

The success of vaccines over the past several decades has been so immense that infectious diseases which were commonplace just two generations ago are so rare today that many people know little or nothing about them.

But vaccination is an active rather than a passive type of protection. If as a society we become too complacent about immunizations, infections that were very nearly eradicated will return.

Source: Mumps and the value of vaccines;