The following provisional sessions on viroids and viroid-like RNAs are programmed:

• Interaction with host(s) and pathogenesis
• Replication and movement
• Biodiversity of viroid-like RNAs: viroid-like RNAs emergence
• Hepatitis delta like RNAs, ambiviruses and Obelisks
• RNA structure and function, ribozymes
• Diagnosis and epidemiology
• Biotechnology