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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 jan 2000 ano - 550 million children get OPV. China/Australia declared polio-free.

Descrição:

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.

Adicionado na linha do tempo:

19 nov 2023
0
0
350

Data:

1 jan 2000 ano
Agora
~ 25 years ago