Section I. Double-stranded DNA viruses. Chapter 1. Order Caudovirales. Chapter 2. Order Herpesvirales. Chapter 3. Order Asfuvirales. Chapter 4. Order Rowavirales. Chapter 5. Other double-stranded DNA viruses. Chapter 6. Order Lefavirales. Chapter 7. Order Zurhausenvirales. Chapter 8. Order Sepolyvirales. Section II. Single-stranded DNA viruses. Chapter 9. Order Piccovirales. Chapter 10. Order Cirlivirales. Chapter 11. Order Tubulavirales. Chapter 12. Other single-stranded DNA viruses. Section III. Double-stranded RNA viruses. Chapter 13. Order Reovirales. Chapter 14. Family Birnaviridae. Chapter 15. Other double-stranded RNA viruses. Section IV. Positive single-stranded RNA viruses. Chapter 16. Order Hepelivirales. Chapter 17. Order Martellivirales: Bromoviridae. Chapter 18. Order Martellivirales: Togaviridae. Chapter 19. Order Martellivirales: Virgaviridae. Chapter 20. Order Martellivirales: Other Falc