The Truth About Vaccines, page-2951

Evidence shows that the resurgence of whooping cough is due to vaccinated people becoming asymptomatic carriers spreading the disease. The pertussis bacteria have also mutated to more severe strains which the vaccine does not protect against;

..Findings indicated that 85% of the isolates were PRN-deficient and vaccinated patients had significantly higher odds than unvaccinated patients of being infected with PRN-deficient strains. Moreover, when patients with up-to-date DTaP vaccinations were compared to unvaccinated patients, the odds of being infected with PRN-deficient strains increased, suggesting that PRN-bacteria may have a selective advantage in infecting DTaP-vaccinated persons.
- Extract from CDC Minutes; https://www.cdc.gov/maso/facm/pdfs/BSCOID/2013121112_BSCOID_Minutes.pdf

The Ugly Untold Truth About the Pertussis Vaccine
Sep 14, 2015

So, to sum up:

1. The pertussis vaccine doesn’t prevent transmission of the disease (and in fact may increase transmission since vaccinated individuals are likely to be asymptomatic and hence no precautions not to expose infants in the family will be taken).
2. Most pertussis strains now in circulation in the US are PRN-deficient.
3. Vaccinated individuals are at a higher risk of infection from PRN-deficient strains than unvaccinated

The corollary sees inescapable that now–ironically thanks to public vaccine policy–vaccinating children for pertussis not only places any infants in the family at risk of getting the disease, but also places at greater risk the vaccinated children themselves.

Read the complete report here; http://www.jeremyrhammond.com/2015/09/14/the-ugly-untold-truth-about-the-pertussis-vaccine/