http://articles.mercola.com/sites/articles/archive/2012/07/30/whooping-cough-vaccine.aspx?e_cid=20120805_SNL_MS_1
Surprise! Whooping Cough Spreads Mainly through Vaccinated Populations
In 2010, the largest outbreak of whooping cough in over 50 years occurred in California. Around that same time, a scare campaign was launched in the California by Pharma-funded medical trade associations, state health officials and national media, targeting people opting out of receiving pertussis vaccine, falsely accusing them of causing the outbreak.
However, research published in March of this year paints a very different picture than the one spread by the media2.
In fact, the study showed that 81 percent of 2010 California whooping cough cases in people under the age of 18 occurred in those who were fully up to date on the whooping cough vaccine. Eleven percent had received at least one shot, but not the entire recommended series, and only eight percent of those stricken were unvaccinated.