This vaccine switch may soon make polio history
The transmission of type 2 polio was eradicated in 1999, meaning immunising against it now is pointless.
Apr 18, 2016, 12:45 PM IST
The transmission of type 2 polio was eradicated in 1999, meaning immunising against it now is pointless.
Apr 18, 2016, 12:45 PM IST