Whopping cough is a bacteria. They can not vaccinate for a bacteria. The only thing the vaccine does is lessen the symptoms, so a vaccinated person can spread it and not even no it. That is one reason my children do not get the vaccine.
In early 2010, a spike in cases appeared at Kaiser Permanente in San Rafael, and it was soon determined to be an outbreak of whooping cough -- the largest seen in California in more than 50 years.
Witt had expected to see the illnesses center around unvaccinated kids, knowing they are more vulnerable to the disease.
"We started dissecting the data. What was very surprising was the majority of cases were in fully vaccinated children. That's what started catching our attention," said Witt.
http://www.reuters.com/article/2012/04/03/us-whoopingcough-idUSBRE8320TM20120403