India celebrated an historic milestone earlier this month when the World Health Organisation announced there had been no new cases of wild polio virus for one year. That leaves only three polio endemic countries: Pakistan, Afghanistan and Nigeria. To understand the scope of this achievement, consider that 20% of all births worldwide today are in India. According to the United States Agency for International Development (USAID), one child is born here every 20 seconds, and each has to be vaccinated in order to completely wipe out polio - from the most rural outposts to shanty towns in urban hubs and everywhere in between.