People who are fully vaccinated against polio are not at risk, but in countries where routine vaccination is not encouraged, similar immune-deficient patients could potentially start a new polio outbreak.
As for how potent that virus has become, Live Science reports that it was able to paralyze a mouse but was found to be harmless when tested on the blood of vaccinated humans.
As for how potent that virus has become, Live Science reports that it was able to paralyze a mouse but was found to be harmless when tested on the blood of vaccinated humans.