The US still vaccinates against polio, but we don’t use the OPV anymore: https://www.cdc.gov/vaccines/vpd/polio/index.html https://www.cdc.gov/vaccines/vpd/poli

The US still vaccinates against polio, but we don’t use the OPV anymore: https://www.cdc.gov/vaccines/vpd/polio/index.html https://www.cdc.gov/vaccines/vpd/polio/index.html The OPV is still used in the few countries where there is polio in the wild because it does have advantages over the IPV.