"An exclusive private school has been hit with dozens cases of whooping cough, which has sickened a large number of teenagers across Los Angeles County.
Health officials say they are monitoring three large clusters of highly contagious whooping cough among 11- to 18-year-olds. The county Department of Health issued a health alert to pediatricians and other health care providers about the uptick in whooping cough last week.
Of about 1,600 students attend Harvard-Westlake, where tuition is close to $40,000 a year, only 18 opted out of vaccinations for medical reasons. None of the 30 students who contracted whooping cough were not vaccinated."
Note: "None of the 30 students who contracted whooping cough were not vaccinated"
Only vaccinated kids got the disease. No unvaccinated kid did.