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(Science: virology) genus of the reoviridae having a double layered capsid and 11 double stranded rNA molecules in the genome. They have a wheel like appearance in the electron microscope and cause acute diarrhoeal disease in their mammalian and avian hosts.

probably the most important cause of severe dehydrating diarrhoea in children under three years of age worldwide.

symptoms include nausea, vomiting, low-grade fever and diarrhoea. Aggressive fluid replacement is generally required.