I'm not sure what exactly GP is referencing, but maybe it's the rare cases when the weakened virus in OPV mutates and someone excretes infectious, vaccine-deriv

I'm not sure what exactly GP is referencing, but maybe it's the rare cases when the weakened virus in OPV mutates and someone excretes infectious, vaccine-derived poliovirus. I still don't see how that's the fault of the vaccine providers, since it's due to mutation and not a mistake in production of the vaccine, and OPV is a reasonable thing to use and certainly better than doing nothing.