Polio: The Final Assault?

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Science  26 Mar 2004:
Vol. 303, Issue 5666, pp. 1960-1968
DOI: 10.1126/science.303.5666.1960

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WASHINGTON, D.C., ATLANTA, AND DELHI-- Years of effort and billions of dollars have driven polio to just a few impoverished corners of the world. The campaign is intensifying, but the virus is tenaciously resisting.