If you understand the limitations of the two types of vaccines, then these polio stories that pop up are just something that should be expected to happen. The

If you understand the limitations of the two types of vaccines, then these polio stories that pop up are just something that should be expected to happen. The US vaccinates with the non-live version. This non-live version cannot mutate, but it is non-sterilizing- the vaccinated can still become infected in their gut- the vaccine prevents it from getting into their bloodstream and become poliomyelitis. We now see this outcome in some articles about Polio showing up in sewage samples in the developed world where this vaccine is given. So polio is already spreading and the un-vaccinated population in question here is not necessarily increasing the spread of Polio. The tragedy though is that someone is now suffering paralysis from poliomyelitis which probably would not have happened if the person were vaccinated.