Vaccine-derived polioviruses (VDPVs), genetically divergent strains from the oral poliovirus
vaccine (OPV), fall into three classifications: 1) circulating VDPVs (cVDPVs) from outbreaks …

Background Mass campaigns with oral poliovirus vaccine (OPV) have brought the world
close to the eradication of wild poliovirus. However, to complete eradication, OPV must itself …

Following the synchronized switch from trivalent oral poliovirus vaccine (tOPV, types 1, 2,
and 3) to bivalent oral poliovirus vaccine (bOPV, types 1 and 3 only) in 2016, transmission of …

WHO has confirmed an outbreak of at least ten cases of polio in Syria, where vaccination
coverage has dramatically decreased during the civil war. 1 Furthermore, wild-type …

During January 2021–December 2022, 76 cVDPV type 2 outbreaks occurred in 42
countries. Since 2020, the numbers of paralytic cases and new emergences have declined …

Background Novel oral poliovirus vaccine type 2 (nOPV2) was administered in Liberia in
response to an outbreak of circulating vaccine-derived poliovirus type 2 (cVDPV2) in 2021 …

Progress Toward Polio Eradication — Worldwide, January 2017–March 2019 | MMWR Skip
directly to site content Skip directly to page options Skip directly to AZ link Centers for Disease …

Update on Immunodeficiency-Associated Vaccine-Derived Polioviruses — Worldwide, July
2018–December 2019 | MMWR Skip directly to site content Skip directly to page options Skip …

Following the confirmation on July 21, 2022, of a case of poliomyelitis related to circulating
vaccine-derived poliovirus (cVDPV) type 2 in an unvaccinated adult from Rockland County …

Achieving the 1988 World Health Assembly commitment of global eradication of
poliomyelitis1 will require ending the transmission of all three types (1, 2, and 3) of wild …