The Disneyland measles outbreak is shedding new light on the debate of the vaccination of children. 

All of the patients who caught the disease reported visiting Disneyland or Disney California Adventure Park in Orange County, California sometime between December 15 and December 20, 2014, according to a news release

Many of them were also never vaccinated for the measles. 

Orange County California is home to the majority of the state's unvaccinated children and the area with the most measles patients in 2014, reported CBS News

Of the children infected in Disneyland, only one was vaccinated, according to a LA Times report. 

Many parents are opting against the vaccination of their children because they fear the side effects.

"Vaccines are a victim of their own success," Orange County pediatrician Dr. Bob Sears told CBS News. "Parents just don't fear the diseases anymore and parents also don't want their child to have a bad side effect." 

From January 1 to November 29, 2014, there were 610 confirmed measles cases reported to the Centers for Disease Control and Prevention. The agency reported that this was the highest number of cases since the disease was believed to be eliminated in 2000. 

The CDC said most of the people who get the measles are unvaccinated and it's most commonly spread by travelers who enter the country carrying the disease and go to a public place, such as Disneyland. 

One mother, Rebecca Esteep, stopped vaccinating her children after her son had a severe reaction to the vaccination. 

"[Parents] know they are taking a risk and that their child may be susceptible to some of the infectious diseases out there, and it's a tough choice," Esteep told CBS News.

Reversely, some doctors say the vaccination is a must to make sure your child stays measles-free.

"When we see cases of the measles that we know are completely preventable by a vaccine ... these are safe vaccines and there really is disease out there (that) they are preventing," Dr. Matt Zahn of Orange County Health Care Agency told CBS News.