In other some countries, the most virulent antivaxxers are religious fundamentalists. Boko Haram and Taliban are hardcore against vaccination, considering it a Western plot to sterilize Muslim boys. Hence polio resurgence in areas under their control. In others, it is more of a political thing, as in Italy with the 5 Star movement. What they all have in common with our own brand is an utter rejection and contempt for scientific method and evidence. Hard to reach someone when the core of their belief is that the very method you use to determine what is true is not trustworthy.
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