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Norovirus is a viral foodborne pathogen¹ that can cause foodborne disease. A publication by Scallan et al.² in 2011 estimated that 55 5,461,731 human foodborne botulism norovirus cases, including 9 149 deaths, occur annually in the US.

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Additional resources on norovirus:
A number of key sources on norovirus are available. 

 References
¹http://en.wikipedia.org/wiki/Clostridium_botulinumNorovirus
²Scallan et al. 2011.Emerging Infectious Diseases 17:7-15  PMID:21192848