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Does anyone know the difference between the stomach flu & sickness, diarrhoea bug & norovirus?
There's no such thing as stomach flu, I believe the term is used in the states to refer to gastric bugs.
Norovirus is a group of viruses that cause gastroenteritis, very common especially at this time of year.
There are many different strains of viruses that cause sickness and diarrhoea.