As part of a collaboration between Harvard Opinion Research Program (HORP) at Harvard School of Public Health (HSPH) and UNICEF, researchers at HSPH conducted a series of polls about polio vaccine among parents and other caregivers of children under age 5 in select parts of Pakistan and Nigeria that are at greatest risk for polio transmission. As the global polio eradication effort moves closer to reaching the goal to end polio, these polls are part of a global research initiative to understand and respond to parents' views and experiences receiving polio vaccine.