Type 2 Poliovirus Detection after Global Withdrawal of Trivalent Oral Vaccine

The Global Polio Eradication Initiative has relied on oral poliovirus vaccine (OPV) to bring polio to the brink of eradication. Only 22 cases of poliomyelitis caused by wild poliovirus were reported in 2017 (all serotype 1). OPV is currently used in routine immunization and in mass campaigns among…

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