Vaccines have saved millions of lives, but there are still people who refuse to acknowledge that their choice to not get vaccines puts the lives of other people at risk. On a Reddit thread where doctors were asked to share their worst experience with anti-vaxxers, a mother decided to tell her infuriating story. When organizing a birthday party for her child, she decided not to invite an unvaccinated girl because she could compromise the health of another guest who recently had cancer.