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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: virology) A genus of viruses (family reoviridae) that are 75 to 80 nm in diameter, with distinct double layers of capsomeres, and have vertebrates as hosts; a causative relationship to illness has not been proven.

They have been recovered from children with mild fever and sometimes diarrhoea, and from children with no apparent infection; from chimpanzees with coryza; monkeys and mice; and cattle faeces.

There are three antigenically distinct human types related by a common complement-fixing antigen.