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Class III viruses that have a segmented double-stranded RNA genome with eight to ten segments each coding for a different polypeptide. Only one of the RNA strands (the minus strand) acts as template for mRNA (plus strand). The capsid is icosahedral and the virion has all the enzymes needed to synthesize mRNA. Reoviruses are found in the gut and respiratory tract where they seem to be nonpathogenic (‘respiratory, enteric, orphan viruses’), although some pathogenic viruses including orbivirus and rotavirus are now classed as reoviruses.

Subjects: Chemistry — Medicine and Health.

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