Rotaractor Sandeep Sarraf from Birgunj, Nepal, administers polio vaccine to children in a rural community during a Subnational Immunization Day. Border towns with little regulation like Birgunj create high risk of the spread of the poliovirus. Subnational immunization days take place more often than larger annual events and target strategic locations based on research by Rotary’s polio eradication partners, the World Health Organization, UNICEF, and the U.S. Centers for Disease Control.