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Viroids are the smallest autonomous infectious nucleic acids known today.Coleus blumei (coleus) is an ornamental plant grown worldwide and it can be infected by several viroid species in the genus Coleviroid, family Pospiviroidae.Up to now, six main viroids infecting coleus have been reported: Coleus blumei viroid-1 ~Coleus blumei viroid-6 (CbVd-1~CbVd-6).