Norovirus is the name given to a virus now known to be one of the main causes of gastroenteritis food poisoning. In reality, the term is applied to a number of similarly constructed viruses which also cause stomach and intestinal inflammation that in turn induces nausea vomiting and diarrhea.  It was originally called the Norwalk virus, after the Ohio town of that name where it was first identified.  Researchers had taken the opportunity provided by an outbreak of stomach problems. In the Norwalk elementary school, to follow through on previous studies, and prove what was long suspected, that a virus can be responsible for gastroenteritis problems. Today it is recognized that Norovirus is one of the major causes of gastroenteritis outbreaks and isolated, individual instances as well.  The outbreak in Norwalk occurred in 1968 but it wasn’t until 1972 that the virus had been isolated.  A big factor in the researcher’s success had been the use of Immune Electron Microscopy, a technique, developed in the...