Of course, the story is a bit different than your small quote would make it sound. Let's look at an expanded quote from the article, shall we?
"Neither TDap nor the child version of the vaccine, DTaP, is foolproof. A majority of the 522 cases are in vaccinated children, Kelso said, adding that the effectiveness fades as years pass. According to the Centers for Disease Control and Prevention website, DTaP vaccines are 80 percent to 90 percent effective, and "about seven of 10 kids are fully protected five years after getting their last dose." Children typically receive five doses of DTaP between the age of 2 months and 6 years.
The highest incidence in Vermont is in the 10-to-14-year-old age group, Kelso said.
As for the adult vaccine, the CDC website states: "Our current estimate is that Tdap vaccination protects 7 of 10 people who receive it."
Vaccinated people who come down with the disease tend have less severe cases, Kelso said."
Oh shit, it works............
grasping for straws "majority of the 522 cases are in vaccinated children'
Did you not see that the most incidences were in the 10-14 year old range? That apparently means the full effects of the vaccine may have lessened or even worn off if it was administered in early childhood.
It sounds like the issue is not whether the vaccine works, but how effective it is for how long.
You seem to be implying that this specific vaccination, and vaccinations in general, are ineffective.