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Norwalk Virus Not Confined to Cruise Ships

The Norwalk virus -- now famous for making cruise passengers ill -- is affecting people across the country. Boston reports 17 new cases, triple the number in years past. It's not fatal, but it often leads to 48 hours of the worst flu-like symptoms one can experience. NPR's Michele Norris talks with Dr. Anita Barry of the Boston Public Health Commission.

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