Till as recently as 2009, India was home to more than 60 percent of the world’s polio cases. Challenges posed by a large population and tropical climate were compounded by difficult geographical terrains. With the joint efforts of the government and partners of the Global Polio Eradication Initiative, notably the World Health Organization, Rotary International and Unicef, annual vaccinations of all children under the age of five have ensured that India has not had a single case of the wild polio virus since 2011.