"Sooner or later you get to the point... where all the polio cases in the world are caused by the vaccine." http://www.vox.com/science-and-health/2016/1/8/10736036/polio-vaccine-risk-eradication …
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"Sooner or later you get to the point... where all the polio cases in the world are caused by the vaccine." http://www.vox.com/science-and-health/2016/1/8/10736036/polio-vaccine-risk-eradication …