Polio case puzzles state health expertsby Cathy Wurzer, Minnesota Public Radio
The investigation continues into how an infant in central Minnesota became infected with the polio virus. This is the first case of a polio infection in the U.S. since doctors in this country stopped using the live virus vaccine in 2000. Kris Ehresmann of the Minnesota Department of Health says this case does not pose a health threat to the general public. She talked to MPR's Cathy Wurzer.