The country’s last case of the wild polio virus was detected on 13 January, 2011, in a two-year-old girl in the state of West Bengal. Three years without any new cases means India can now be declared polio-free.
Afghanistan, Pakistan and Nigeria are the only countries in the world where the disease remains endemic.
Nata Menabde, India’s World Health Organisation representative, said: “We give huge credit to the government … It makes us extremely proud and highly responsible for having helped the government to reach this incredible achievement.”
Ms Menabde said the WHO would officially declare India as polio-free by the end of March, when the legal process for certification was completed.
Until the 1950s, polio crippled thousands of people every year in rich countries. It attacks the nervous system and can cause irreversible paralysis within hours of infection.
The highly infectious disease often spreads in areas with poor sanitation – a factor that helped it keep a grip on India for many decades – and children under five are the most vulnerable. It can be prevented by population-wide vaccination.
India had been considered one of the toughest places in the world to eradicate polio. Many families in poor, high-risk states such as Bihar and Uttar Pradesh migrate for work, while other communities live in remote or inaccessible areas.
Ms Menabde said millions of people were involved in the drive to immunise children.
They targeted migrant families at bus stations, on trains, at construction sites, and at local festivals. Some used motorbikes or trekked on foot to reach remote villages.
As a consequence, more than 170 million children are immunised every year, with millions more targeted on house-to-house visits. The drive has cost the government the equivalent of £1.5 billion since 1995.
In 2009, 741 Indians fell sick with polio, nearly half the world’s cases that year. The number dropped to 42 in 2010 and there was only one in 2011.
India’s success has given impetus to the global fight against polio, Ms Menabde said.
She said: “While the whole global eradication was stagnating, India has been the rescuer of this belief that it is possible,” she said. “Donors and partners were losing hope and patience. Now they are all actively mobilised into channelling their efforts.”
There were 148 cases of polio in Afghanistan, Nigeria and Pakistan in 2013, while 224 new cases were detected in non-endemic countries including Somalia, Syria and Kenya.
These countries face a range of challenges such as violent conflicts, weak health systems and poor sanitation. In Pakistan, gunmen frequently attack polio vaccination workers, accusing them of being Western spies and part of a plot to sterilise Muslims.