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The defeat of polio proved that immunisation saved lives,

but there's a sting to the tale

The rising number of vaccine-derived polio outbreaks has important implications for how we deal with Covid-19

https://www.theguardian.com/global/2020/nov/15/the-defeat-of-polio-proved-that-immunisation-saved-lives-but-theres-a-sting-to-the-tale?CMP=Share_AndroidApp_Other&fbclid=IwAR14Cvpx-i0I2WGrMNzCSX0l5Rk8ult_ftlD8IEdUVCeab7o90wwO9ZJ-0k