THE WORLD IS closer than ever to eradicating the polio virus. When the effort began in 1988, the disease was endemic in 125 countries, but now just three remain: Nigeria, Pakistan and Afghanistan. In recent months, there have been fewer cases in fewer districts of fewer countries than at any time in history. Margaret Chan, director-general of the World Health Organization (WHO), said recently that the battle against polio is at a “tipping point between success and failure.”
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