Victory owed to 2.4 million health workers who visited 200 million households to vaccinate 172 million children.
![The World Health Organisation officially declared India to be polio free on March 27 [AP]](https://www.aljazeera.com/wp-content/uploads/2014/02/2014117111855676734_20.jpeg?resize=270%2C180&quality=80)
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Victory owed to 2.4 million health workers who visited 200 million households to vaccinate 172 million children.
