### Summary box Polio is a faecal-orally transmitted, highly infectious disease caused by wild-type polio virus (WPV) types 1, 2 or 3.1 2 Today, the majority of polio outbreaks are… Click to show full abstract
### Summary box Polio is a faecal-orally transmitted, highly infectious disease caused by wild-type polio virus (WPV) types 1, 2 or 3.1 2 Today, the majority of polio outbreaks are caused by circulating vaccine-derived polio viruses (cVDPV) originating from back-mutations of oral polio vaccine (OPV) viruses which have recovered the WPV phenotype properties of neurovirulence and transmissibility; most cVDPV originate …
               
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