Whooping Cough Cases Spike in California County

A school nurse prepares a vaccine against whooping cough before giving it to students at a school in California. The boosters, also called Tdap shots, are required of all seventh graders before they can start school. The Los Angeles Unified School District is offering free shots at various clinics in the city to help students make the deadline before school start on August 14. Kevork Djansezian / Getty Images

The rise in case in Santa Clara County — 3 people have died across the state — is being made worse by some who choose not to vaccinate their kids.

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