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The risk of the four cases triggering outbreaks in the U.S. is considered very small, he added.
"We don't think it spreads from one person to another rapidly" and will not move through the population like the flu, he said.
The CDC sent a notice to U.S. doctors Friday, advising them to be on the alert for cases.
As the investigation into the E. coli strain from the outbreak continues, CDC officials say they have never seen the strain here but are aware of at least two previous reports of a similar strain elsewhere. One was a 29-year-old woman in South Korea, reported in 2006. The other was a small cluster of cases in the Republic of Georgia in 2009.
Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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