The anti-vaccine movement is a problem but they're not really the big problem this time. Basically, the global effort to eradicate polio failed catastropically

The anti-vaccine movement is a problem but they're not really the big problem this time. Basically, the global effort to eradicate polio failed catastropically due to a major flaw in the strategy devised by the WHO and all the other groups involved in it, this directly caused a wave of new polio cases that is now starting to reach the western world, and no-one has figured out a way to fix it: https://www.science.org/content/article/polio-eradication-program-faces-hard-choices-endgame-strategy-fails https://www.science.org/content/article/polio-eradication-pr... (Notice also the date on that article: two and a half years ago. It took a while for this to spread out of Africa and I certainly didn't anticipate at the time how likely this was.)