Polio:2, People: 1; 15 Years to Go (How Polio is Fighting Back)

Polio emerged as an epidemic disease in the late 19th century, quite unexpectedly. It quickly became the bane of the world, striking terror as seasonal epidemics. Relief came in the form of vaccines in the mid-20th century. But, despite massive vaccination campaigns, pockets of polio surface intermittently in parts of the world that have already eliminated the virus. Scientists know exactly where these cases of polio originate, but nothing we have done so far has succeeded in completely eradicating the polio virus from the earth. In this video, you will learn what the underlying cause of this recurring problem is and how we could eliminate the virus once and for all.
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By Hewa - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=17839345