It's worth noting that the Cutter incident involved contaminated/improperly produced inactivated-virus vaccines.
The article implicates live virus vaccines, not inactivated virus vaccines, in periodic outbreaks primarily outside the US and Europe (which do not use live-virus polio vaccines)
The article implicates live virus vaccines, not inactivated virus vaccines, in periodic outbreaks primarily outside the US and Europe (which do not use live-virus polio vaccines)