The anti-vaccination movement is dangerous not only to the children who don't receive their disease immunity, but also to medically vulnerable individuals who once benefitted from the "herd immunization" of the population.
For instance, mother Nicole Stellon O'Donnell recently wrote a Twitter thread showing what happened when her daughter, who can't receive immunizations due to her cancer treatments, encountered the child of an anti-vaxxer in a supermarket.
O'Donnell shared a terrifying story of what happens when anti-vaxxers insist keeping their children untreated will keep them healthy.
Not only did the anti-vaxxer's child contract measles, exposure to the disease made an even larger impact on O'Donnell's child, who was already vulnerable.
The tiny supermarket interaction turned into a months-long nightmare.
Ultimately, O'Donnell's daughter's story could have been a lot worse.
But even with everything ending up ok, it was a terrible ordeal.
On Twitter, many others shared similar situations they'd been in.
Vaccinations aren't just for the people who receive them—they protect the very young and very old, who are most endangered by diseases.
What's more, there is absolutely no credible evidence that links vaccinations to autism.
O'Donnell was also thrilled to see her thread retweeted by none other than Harry Potter author J.K. Rowling!
According to the World Health Organization and CDC, all children who are able should receive their vaccinations.
Parents who deny their children safety from these once-thwarted diseases are not only putting them in danger, but putting the other families in danger as well.