Nigeria will launch a new campaign to vaccinate millions of children against polio on Nov. 26 in an attempt to curb the spread of the disease that has crippled hundreds this year, the WHO said. Africa's most populous country, which accounts for more than 50 percent of new polio cases in the world, has struggled to tame the contagious disease since some states in the mainly Muslim north imposed a year-long vaccine ban in mid-2003. New polio infections in Nigeria have climbed 225 percent to 751 this year because many children in the north missed several rounds of immunization towards the end of 2007. (Reuters)

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