> If you've given the IPV vaccine, you can later be infected and spread polio (with a little less likelihood), but won't become sick. > If you're given the OPV

> If you've given the IPV vaccine, you can later be infected and spread polio (with a little less likelihood), but won't become sick. > If you're given the OPV vaccine, you eventually will have sterilizing immunity, and won't spread it, once immunity develops a small time after vaccination. But the OPV vaccine itself very rarely causes polio outbreaks. What if we have IPV first then OPV as a booster, would that give sterilizing immunity with less risk?