Needle syringe with a vaccine bottle. Credit: NIH

Decades ago, parents who chose not to immunize their kids for philosophical or religious reasons were a tiny fraction of the population, according to an inewsource analysis of California data.

Their numbers are still small, but they grew from about one-half of a percent in the 1980s and ‘90s, to 2.5 percent statewide in this most recent school year.

“Parents did not question the vaccines at that time. I think there was a lot more confidence and trust in the physicians,” said Catherine Flores-Martin, director of the California Immunization Coalition, a vaccine advocacy group.

Chart designed on Piktochart. Credit: Leo Castaneda

Blame the Internet and a now discredited study linking autism to vaccines for the mistrust and misinformation about vaccine safety, Flores-Martin said.

“Parents were able to do research on things that concerned them and get more acquainted with medical information,” she said, referring to the early days of the Internet. “And they found studies that may have supported their beliefs, however incorrect that they are.”

To Flores-Martin’s point: Google “vaccine” and “autism” and more than 10 million results appear, including many sites that continue to incorrectly link vaccines to autism.

The debunked study by British researcher Andrew Wakefield in 1998 helped get the anti-vaccine movement started. Wakefield’s study looked at 12 kids with autism, and claimed there was a link between the MMR (measles, mumps, and rubella ) vaccine, autism, and bowel disease. The paper was officially retracted in 2010.

The debunked study by British researcher Andrew Wakefield in 1998 helped get the anti-vaccine movement started.

Before Wakefield’s study, in the 1994-95 school year, the personal belief exemption rate was 0.5 percent in California. In the 2000-2001 school year, two years following the publication of Wakefield’s paper, personal belief exemptions climbed to more than 7 percent.

By 2004, they fell back down to just over 1 percent and have slowly been crawling upward, with the exception of this most recent school year when they fell slightly.

Chart designed on Piktochart. Credit: Leo Castaneda

Overall vaccination rates in California have increased dramatically in the past three decades. In the 1984-85 school year, just under 85 percent of kindergartners were up to date with their vaccines, compared to more than 90 percent this year. Flores-Martin said lack of access was the biggest reason children didn’t get immunized in the 1980s.

That changed when Congress created the Vaccines for Children Program in 1993. It followed one of the worst  measles outbreaks  in the U.S. between 1988 and 1990. There were more than 16,000 cases and 75 deaths, with low-income Hispanic children and young adults who weren’t immunized among the most impacted.

A recent measles outbreak that can be traced to  Disneyland has raised awareness about parents who choose not to vaccinate their children. It has sickened more than 150 people in 17 states, according to the most recent Centers for Disease Control and Prevention statistics.

Joanne Faryon is a freelance reporter and former inewsource and KPBS reporter.

Joe Yerardi is a freelance data journalist for inewsource, where he worked between 2013 and 2016 as an investigative reporter and data specialist. To contact him with questions, tips or corrections, email

4 replies on “Opting out of vaccines: blame the internet”

  1. Why don’t you blame the fake science, anyone that isn’t vaccine damaged can see that from a mile away.

  2. Are you seriously suggesting, O Goddess of Wisdom, that the recent outbreak of measles, investigated carefully and found to be due to unvaccinated children spreading the virus to other unvaccinated children in a very public place (Disneyland), supports the choice of those children’s parents not to have them immunized? If the citizens of your city state had known what is known now about preventing epidemics, do you think they would have allowed unvaccinated Greek children to gather in the Agora? What scales, O Goddess, do you use to weigh private privilege against public good, and find the former so weighty?

  3. Dr. Maurice Hilleman, the creator of the measles and many other vaccines, admits in this interview originally aired on PBS but later buried, that vaccines are dangerous and all contain wild undetectable viruses that cause cancer, leukemia, and more diseases. As Chief of the vaccine division of Merck Pharmaceuticals he witnessed the AIDS virus and SV40 cancer viruses deliberately allowed to go into polio and other vaccines. He also states that the media and government lied and covered up the truth that polio was not stopped by the vaccine, but rather introduced the cancer epidemic in this country..

    YouTube video

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