sábado, 25 de enero de 2020

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, vaccination, polio comeback, polio outbreaks, india, express explained, indian express

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



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.

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