Pakistan and Afghanistan are very dangerous places for a Jew to go.
Things are changing with the Abraham accords, but in general Jews do not travel to Muslim majority countries - they would be killed on sight.
OPV isn't just used in Muslim countries. Nigeria is the biggest source of cVDPV2 infections. Ghana, Chad, Niger, etc. have cases. Ukraine has cases. Even Israel has cases.
Nigeria and Chad are Muslim majority country, not someplace a Jew can go. Niger is almost 100% Muslim.
Israel is interesting: They use both IPV and OPV - IPV to prevent vaccine drived Polio, and OPV to ensure Polio eradication which IPV can't do.
I would be interested to learn more about this statement.