Norovirus infection: winterbug or stomach bug  Norovirus is a non-enveloped virus that causes infection into the stomach and intestines of humans.  Norovirus disease is a highly infectious disease that causes gastroenteric disturbances such as vomiting  and non-bloody diarrhea,which also occur in gastroenteritis.  A person infected with norovirus continues to shed off the germs of the disease via feces (poop) or vomitus.  The infection usually lasts for about 1 to 3 days. The symptoms may b from mild to severe degree. The infection of norovirus is also referred to as a winter vomiting bug or stomach flu or stomach bug by many people.  Norovirus infection can be prevented and controlled by emphasizing on proper hand hygiene  and safe drinking water practices . What are the symptoms of Norovirus infection? Norovirus infection can be characterised by the following three major symptoms: 1. Nausea and vomiting 2. Loose watery stools (diarrhea) 3. Stomach cr...