From your article: “According to the state Department of Health, sequencing on this case showed it was revertant polio Sabin type 2 virus. This points to a transmission chain from an individual who received an older form of oral polio vaccine that hasn't been used in the U.S. in over two decades.

The new case may stem from someone who got such a vaccine outside the U.S. and spread the vaccine-derived strain of the virus, officials said. State Sen. Elijah Reichlin-Melnick said the case appeared to have come from outside the U.S.”

There was some polio detection in sewage recently in the UK and this article gives a run down on vaccine derived cases from countries still using attenuated live virus versus inactivated vaccination in places like the UK.

[lshtm.ac.uk]

If vaccination rates are high enough hopefully no worries. But: “Some people might be confused by the fact that a vaccine can be used to combat a vaccine-derived strain of polio, as this appears counter-intuitive at first. However, multiplication of vaccine-derived polio viruses can only happen if there is poor immunity against polio in the community, and with polio vaccine coverage at only 86% in London we have a potential pool of susceptibles. Hence the mission now has to be that everyone looks at their immunisation books and gets their series completed, so we close the gap and don’t allow these strains to spread.”

Also: “ Sabin-virus based vaccine (live oral polio vaccine) is now only being used in countries that are in the active eradication phase of polio eradication – other countries have switched to inactivated polio virus vaccine that cannot mutate.” […] “ These cVDPV [circulating vaccine-derived polio virus] can develop from individuals who received oral polio virus vaccine in a different country that continues to use oral polio vaccine, continue to excrete polio virus and can pass it on over long times. In the UK we have not been using oral polio vaccine since 2003, given that polio was eradicated in the UK. Here we use the inactivated vaccine which does not carry the risk of VDPV, but also does not induce immunity at the level of the gut mucosa-which is the advantage of the oral vaccine. The trade-off is that the attenuated live virus used in the oral polio vaccine can mutate – and this then leads to VDPV.”

Jersey. All bad things come from Jersey.

This case may have resulted at least indirectly from an old type of vaccination for polio no longer used in the US but that may be an educated guess.

When I was in second or third grade, they had every kid in town lined up for sugar cubes. I'm sure many of us were already vaccinated but better safe than sorry. My grandmother was the county public health nurse so she played a major role.