jan 1, 2000 - 550 million children get OPV. China/Australia declared polio-free.
Description:
A record 550 million children – almost 10% of the world's population – receive the oral polio vaccine. The Western Pacific region, spanning from Australia to China, is declared polio-free.Added to timeline:
Date:
jan 1, 2000
Now
~ 25 years ago