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Usually, it's transmitted by direct human contact, but can contaminate surfaces. Leafy greens, fresh fruits and shellfish are commonly involved in foodborne outbreaks.
An epidemiologist at the Centers for Disease Control and Prevention said the work also shows how hardy the norovirus is and how difficult it is to control.
"What this report does is it helps raise awareness of the complex and indirect way that norovirus can spread," said Aron Hall, an epidemiologist with the Division of Viral Diseases at the Centers for Disease Control and Prevention.
His agency says the best way to fend off the virus is thorough hand-washing and cleaning contaminated surfaces with a bleach-based solution.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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