19 Kids diagnosed with Whooping Cough despite being up to date on vaccinations

19 kids in Summit County diagnosed with whooping cough despite being up to date on vaccinations
Officials said all of the children who have been diagnosed were vaccinated against the illness. What was that about vaccines being effective?
http://fox13now.com/2015/03/27/19-kids-in-summit-co-diagnosed-with-whooping-cough-despite-being-up-to-date-on-vaccinations/