Here are the CA counties that do not have herd immunity against measles

LOS ANGELES (KABC) -- 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.

Sutter County, near Sacramento, has the lowest vaccination rate in the state at just 75.8 percent. Vaccination rates remain high in Southern California.

Los Angeles County's measles vaccination rate is 97.1 percent and Orange County is at 97.4 percent.

However, San Bernardino County's measles vaccination rate is below the herd immunity threshold at 93.5 percent.

Dr. Alvaro Galvis at Loma Linda University Children's Hospital is concerned and said other childhood diseases are increasing.

"One of the biggest ones that is probably making a coming back, even in San Bernardino, is whooping cough," Dr. Galvis said, "it is much more commonly diagnosed than it used to be in the last five years."

New nationwide data the CDC shows just 92.5 percent of America's kindergarten students were vaccinated for the measles last school year. The data shows there hasn't been nationwide herd immunity since the vaccination rate was 95.2 percent in 2020.