“We have a really high vaccination rate in our community, which is something we’re very grateful for,” Harvard-Westlake spokesperson Ari Engelberg said, according to the Los Angeles Times.

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Thirty students at the private school have reportedly been diagnosed with whooping cough, also known as pertussis, recently.

Engelberg also told reporters that only 18 of Harvard-Westlake's roughly 1,600 students have medical exemptions allowing them to opt out of immunizations. He added that none of those students have contracted the disease.

Los Angeles County officials warned area doctors in an email last week about three clusters in the county, according to the Times.