California is facing its worst rash of whooping cough cases in decades.
Dr. Kathleen Harriman is chief of the Vaccine-Preventable Diseases Epidemiology Section, for the California Department of Public Health.
"Through the end of November of this year, we've had close to 10,000 cases reported in California. So, we've surpassed the number that we had reported 2010, which was also an epidemic year," she said.
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