Whooping Cough May Spread Through Vaccinated Populations
Dr. Mercola | 17 April 2012

. . . 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. . .

There are serious side effects to the DPT vaccine, including brain injury:

. . . Either way, getting whooping cough or getting a pertussis vaccination entails a risk. But, remember, the vaccine carries with it two risks: the risk of a serious side effect AND the risk that the vaccine won’t work at all or will only work for a short period of time. . . .