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Immunity And Field Efficacy Of Type 2-Containing Polio Vaccines After Cessation Of Trivalent Oral Polio Vaccine: A Population-Based Serological Study In Pakistan, Arie Voorman, Atif Habib, Imtiaz Hussain, Rana Muhammad Safdar, Jamal A. Ahmed, William C. Weldon, Imran Ahmed, Muhammad Umer, Jeffrey Partridge, Sajid Bashir Soofi
Immunity And Field Efficacy Of Type 2-Containing Polio Vaccines After Cessation Of Trivalent Oral Polio Vaccine: A Population-Based Serological Study In Pakistan, Arie Voorman, Atif Habib, Imtiaz Hussain, Rana Muhammad Safdar, Jamal A. Ahmed, William C. Weldon, Imran Ahmed, Muhammad Umer, Jeffrey Partridge, Sajid Bashir Soofi
Department of Paediatrics and Child Health
Background: In Pakistan and other countries using oral polio vaccine (OPV), immunity to type 2 poliovirus is now maintained by a single dose of inactivated polio vaccine (IPV) in routine immunization, supplemented in outbreak settings by monovalent OPV type 2 (mOPV2) and IPV. While well-studied in clinical trials, population protection against poliovirus type 2 achieved in routine and outbreak settings is generally unknown.
Methods: We conducted two phases of a population-based serological survey of 7940 children aged 6-11 months old, between November 2016 and October 2017 from 13 polio high-risk locations in Pakistan.
Results: Type 2 seroprevalence was 50% among …