Part 1: Emerging Respiratory Viral diseases -- Chapter 1. Factors Contributing to the Emergence of Viral Diseases -- Chapter 2. An updated review on Influenza viruses -- Chapter 3. Avian Influenza: A Potential Threat to Human Health -- Chapter 4. 2019 Novel CoronaVirus -- Chapter 5. Severe Acute Respiratory Syndrome associated Corona Virus -- Chapter 6. Middle East respiratory syndrome coronavirus -- Chapter 7. Respiratory syncytial Virus -- Chapter 8. Human Bocavirus -- Chapter 9. Measles: The disease that refuses to be vanquished.-Part 2: Haemorrhagic Fever Viral Infections -- Chapter 10. Viral Haemorrhagic Fevers -- Chapter 11. Emerging Arbo viral infections -- Chapter 12. Dengue haemorrhagic fever: A resurgent arboviruses in human -- Chapter 13. Crimean- Congo haemorrhagic Fever (CCHF) Virus -- Chapter 14. Ebola Virus Disease: An emerging lethal disease in Africa -- Chapter 15. Hantaviruses as emergent Zoonoses: Aglobal threat -- Chapter 16. Kyasanur Forest Disease - A neglected zoonotic disease of India -- Chapter 17. An imminence to humans and animals: The Rift Valley Fever Virus -- Chapter 18. Yellow Fever: An old scourge with new threats -- Chapter 19. Lassa Fever: An Emerging Immunodeficiency and Oncogenic Viral Infection -- Chapter 20. Lujo hemorrhagic fever -- Chapter 21. Chapare hemorrhagic fever -- Chapter 22. Bas-Congo tibrovirus -- Part 3: Laboratory Diagnosis of Viral Infections -- Chapter 23. Rapid diagnostic of emerging human viral pathogens: Lessons learnt from COVID-19 pandemic -- Chapter 24. Novel Diagnostic methods for emerging Respiratory Viral Infection.-Chapter 25. Evolution of Viral Diagnostics: a peek into time.