Polio — Worldwide/Unknown
The international campaign to eradicate polio, which has vaccinated 2.5 billion people since it began in 1988 — nearly all of them children — has faced one setback after another. Its goal of wiping out the disease from the planet, which was meant to happen in 2000, is about 16 years overdue — but getting close. The campaign has confined the disease to only 3 countries and hopes to reach its goal by the end of this decade.
Now, however, the fight faces a new threat: a critical shortage of
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