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State and federal health officials are trying to determine how a baby in central Minnesota contracted the virus that causes polio, a quarter century after the disease was essentially wiped out in the United States.
The baby, born in the United States, was exposed to a strain of virus found in oral polio vaccines, which haven't been used in the United States for five years.
Investigators are testing relatives and others who have had close contact with the child to see whether anyone else may have been infected. They suspect that someone contracted the polio virus in another country and unwittingly passed it on.
was found to be infected by a strain of polio usualy found in vaccines. However this particular strain has not been used in the US since 1999