In recent times, West Bengal has become highly endemic for the transmission of wild polio virus. A series of Sub National Immunisation Day (SNIDs) and National Immunisation Day (NIDs) have been
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/awareness-schemes-polio-planned
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/statesman-kolkata
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health