Polio comeback in a number of countries: Should India be worried? | Explained News,The Indian Express

Polio comeback in a number of countries: Should India be worried? | Explained News,The Indian Express

Polio comeback in a number of countries: Should India be worried?

Written by Abantika Ghosh | New Delhi | Updated: January 25, 2020 at 4:30 am

There are three variants of the polio virus, numbered 1 to 3. For a country to be declared polio-free, wild transmission of all three kinds has to be stopped. For eradication, cases of both wild and vaccine-derived polio infection to be reduced to zero.