An electron micrograph of the Norovirus, with 27-32nm-sized viral particles.
Norwalk viruses (and related caliciviruses) are important causes of nonbacterial gastroenteritis in the United States. An estimated 181,000 cases of this type of food poisoning occur annually.
Norovirus: Created on September 9th, 2007. Last Modified on November 4th, 2009
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