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Norovirus

An electron microscope image of norovirus particles.
An electron microscope image of norovirus particles. Image: Centers for Disease Control and Prevention (AP)

Norovirus is the most common stomach bug around, causing about half of all known foodborne infections annually. But while the virus can be easily caught from someone else—either from direct contact or from being exposed to their poop or vomit—it has also been detected in the waters of tropical beaches, likely originating from sewage contamination.

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