As children prepare to head back to school, more of their classmates will be without a measles vaccination this school year.
The ABC Data Team examined statistics from the Centers for Disease Control and Prevention, the California Department of Public Health, and the Los Angeles County Department of Public Health. The data analysis found 16 counties in California no longer have herd immunity against measles.
When the vaccination rate of kindergarten students falls below 95 percent, herd immunity is lost, according to the California Department of Public Health, and the chances of the measles virus spreading goes up…