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The School Environment
In the United States there are about 120,000 schools providing for the educational needs of approximately 54 million students. On average, students receive about 20% of their environmental exposure in schools.
Dr. Michael A. Berry
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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.