In Shanghai. China. a polio immunization schedule of four inactivated polio vaccines (IPV) has been implemented since 2020. replacing the schedules of a combination of two IPVs and two bivalent live attenuated oral polio vaccines (bOPV). https://www.ngetikin.com/flash-choice-1-Gallon-Roll-Cote-High-Performance-Moisture-Vapor-Barrier-Coating-and-Primer-limited-super/