There are parents out there who intentionally prevent their children from receiving vaccines.
This is due in part to studies that examined links between vaccination and increased risk of autism.
Despite the fact that public health organizations have not found any link some parents still don't want to take the chance and it has caused a lot of controversy.
Few celebrities have taken a public stance on the issue one of the most vocal has been Jenny McCarthy.
The 41- year- old former playmate is a huge advocate for autism and campaigned against vaccinations claiming they caused her son's condition.
McCarthy also believes her son was cured back in 2009 thanks to alternative treatments and a gluten-free diet.
She was slammed for her opinion and the backlash continues.
Jenny asked a question on Twitter, "what is the most important personality trait you look for in a mate?"
And that simple question opened the floodgates!
Followers began tweeting back responses about vaccines.
Leititia wrote, "someone who understands how science works and who doesn't want their kids to die from entirely preventable diseases."
McCarthy isn't the only one talking about vaccines.
Reality star, Kristin Cavallari, said she and husband Jay Cutler are choosing to not vaccinate their children.
Cavallari said she read too many books about autism and there are scary statistics out there.
She went on to say that she didn't want to speak publicly on it and it's a personal choice.