The reality that some parents choose not to vaccinate their children is a tough one that other parents and teachers face every day.
But one mother took matters into her own hands after finding out one of her daughter's friends was unvaccinated.
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She shared her experience on web forum Reddit, in a thread where doctors were asked to share some of their "worst experiences with anti-vaxxers".
The mother, who goes by the handle 'DankMums', said she only found out her daughter's friend from dance class was unvaccinated after sending out invites to her daughter's birthday party.
"My daughter's best friend is in remission from leukaemia and is immunocompromised. An unvaxxed kid could kill her," she wrote.
"I uninvited the dance kid and very nicely explained the situation."
But the anti-vaxxer mother wasn't at all happy, "losing her shit" and allegedly trying to get the DankMums and her daughter kicked out of their dance school.
"The dance school owner is an older lady and had no idea there were idiots these days that didn't [vaccinate], so she implemented a new rule that students had to be up to date and the unvaxxed kid had to find a new dance school," the mother wrote.
"I felt bad for the kid but her mother is a sociopath. Herd immunity saves lives when it comes to kids fighting cancer."
Supportive parents told her they would have done the same thing.
"This is the thing about anti-vaxxers that really drives me nuts, I feel terrible for their kids getting put at risk, but it's even worse than that, they are putting at risk anyone who is immune compromised!" one wrote.
"I can imagine the old dance school owner lady's reaction to the idea of anti-vaccination, given the relative prevalence of the diseases vaccinated against decades ago when what is now the elderly population were younger," wrote another.
Earlier this year the Australian Government rolled out its 'no jab, no pay' policy nationwide, docking benefits from parents who won't immunise their children.