Table 3 Estimated total tOPV and bOPV vaccine needs based on the global model [25] with different assumptions about the type of vaccine used for SIAs and different SIA frequencies (not including vaccine needed for outbreak response activities) for options that prevent cVDPVs after OPV cessation^a

From: Managing the risk of circulating vaccine-derived poliovirus during the endgame: oral poliovirus vaccine needs