Complexity of options related to restarting oral poliovirus vaccine (OPV) in national immunization programs after OPV cessation [version 1; peer review: 1 approved, 2 approved with reservations]
Wheat Flours Background: The polio eradication endgame continues to increase in complexity.With polio cases caused by wild poliovirus type 1 and circulating vaccine-derived polioviruses of all three types (1, 2 and 3) reported in 2022, the number, formulation, and use of poliovirus vaccines poses challenges for national immunization programs and va