An electron micrograph of the Norwalk Virus, 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.
3630 x 2445 pixels
Print Size @ 300 dpi
12 x 8 inches / 31 x 21 cm
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