This study is based on EPI (Expanded Program on Immunization) immunization surveys and surveillance of polio, its challenges in immunization and the way forward to overcome these challenges.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/resistance-polio-its-eradication-pakistan
[2] http://admin.indiaenvironmentportal.org.in/category/author/masaud-shah
[3] http://admin.indiaenvironmentportal.org.in/category/author/muhammad-kazim-khan
[4] http://admin.indiaenvironmentportal.org.in/category/author/saleha-shakeel-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/virology-journal
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/polio
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pakistan
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/immunisation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-care
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/child-health