WITH THE POWER OF PREPARATION Vaccines May Ensure Children?s Safety The biggest enemy to vaccines is complacency. Often a disease becomes so rare in an area that vaccination will begin to drop. In 1974, Japan saw such low occurrences of pertussis that they stopped vaccinating children, within five years, the inoculation rate dropped from 80% to 10%. In 1979 there was an outbreak that affected 15,000 and caused 41 deaths. This is a prime example of how important vaccines are, even if it seems like they aren?t needed.