This book brings together the knowledge and understanding of viruses from origin to recent advancements. It covers different aspects like classification, structure, emerging viruses, cancer-causing viruses, and vaccines. It emphasizes the basic biology involved in virus existence, evolution, and re-occurrence.

Professor Sachin Kumar is a Professor at the Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati. He completed his Ph.D. at the University of Maryland, USA, in the field of molecular virology. He holds a master's in Veterinary Science from the Indian Veterinary Research Institute. He has over 167 publications and five patents to his credit.

History of virology 2. Viruses and their significance 3. Methods used in virology 4. Transmission of viruses 5. Virus classification 6. Virus structure 7. Virus replication 8. Virus pathogenicity 9. Double-stranded DNA viruses 10. Single-stranded DNA viruses 11. Double-stranded RNA viruses 12. Plus strand RNA viruses 13. Minus strand RNA viruses 14. Retroviruses 15. Reverse transcriptase containing DNA viruses 16. Bacteriophages 17. Plant viruses 18. Oncolytic viruses 19. Emerging viruses 20. Immunity to virus infection 21. Viral vaccines