Replacing trivalent OPV (tOPV) with bivalent OPV (bOPV): Quick reference summary

We are close to the eradication of polio, with a new global endgame plan leading the way to a polio-free world. In the last two decades, immunization efforts have reduced the number of polio cases globally by more than 99%. Of the three poliovirus types (types 1, 2, and 3), type 2 wild poliovirus has been eradicated since 1999.