Norovirus, also known as the winter vomiting bug, is a highly contagious virus that causes gastroenteritis. It is found in the stool or vomit of infected people, and people with norovirus illness can shed billions of virus particles. These particles can spray through the air and land on people or surfaces, leading to further infections.
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The virus is usually spread by the fecal-oral route. This may be through contaminated food or water or person-to-person contact. It may also spread via contaminated surfaces or through the air from the vomit of an infected person. Risk factors include unsanitary food preparation and sharing close quarters.

Noroviruses thrive in close quarters, such as restaurants, day care centers, and nursing homes, because they are hardy and highly contagious. They can survive temperature extremes in water and on surfaces. Outbreaks can happen anytime, but they occur most often from November to April. In the United States, it is the cause of about half of all foodborne disease outbreaks.
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Norovirus results in about 685 million cases of disease and 200,000 deaths globally a year. It is common both in the developed and developing world. Those under the age of five are most often affected, and in this group, it results in about 50,000 deaths in the developing world. Norovirus infections occur more commonly during winter months. It often occurs in outbreaks, especially among those living in close quarters.
In conclusion, norovirus is found in the stool or vomit of infected people and can be spread through contaminated food or water, person-to-person contact, contaminated surfaces, or through the air from the vomit of an infected person. It thrives in close quarters and can survive temperature extremes in water and on surfaces. It is a common cause of gastroenteritis worldwide, particularly in close-quarter environments such as restaurants, day care centers, and nursing homes.


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