Polio in retreat: New cases nearly eliminated where virus once flourished

Scientific American, October 29, 2010

The world's largest, most intractable source of polio may be on the brink of elimination. In India the states of Bihar and Uttar Pradesh have produced more polio cases this decade—nearly 5,000—than any other location worldwide that has an active immunization campaign. Nigeria saw a handful more cases than the two Indian states because it effectively ceased immunizing in 2003 for a time due to false fears of the vaccine.

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