Three things a) we have VAPP now b) polio is not eradicated, check the Global Polio Eradication Initiative website on those. c) in a case where diagnosis was actually improved in the early years of the polio vaccine they discovered they had been dealing with two things with the same symptoms a all along: paralytic polio and Guillean-Barre syndrome. Determining the respective rates of both is an exercise left to the reader.