http://www.npr.org/blogs/health/2012/08/03/157967215/experts-fear-whooping-cough-vaccines-shield-is-waning
"Some 77 percent of children and adolescents who got whooping cough in Washington State last year were up to date on their required shots, she notes."
The majority of pertusiss infections are within the vaccinated population. There has never been a long term scientific study comparing the vaccinated and unvaccinated population, until this is done we will not be vaccinating our children.