Declaring the eradication of polio will be far more difficult than it was for smallpox, according to a review published in the Journal of General Virology. Further research into the complex virus - host interactions and how the vaccine is used in the final stages of the eradication programme is crucial to its success.
Poliomyelitis, also known as infantile paralysis, was one of the most feared diseases of the 1950s. By the mid 1970s, thanks to vaccination, the viral disease had been controlled and eradicated from the developed world, including the UK, US and most of Europe. In 1988, The World Health Organization launched a global eradication programme which is now near completion.
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"The polio-eradication programme and issues of the end game" - (http://vir.sgmjournals.org/content/early/2011/11/24/vir.0.036988-0.full.pdf+html)