Viruses have become an important discipline of microbiology. Many advances in this field due to the interference of sophisticated equipments and processes had lead to identification of new pathogens, its morphological and genomic structure. Viral diseases contribute more to the percentage of infectious diseases in India. Diseases like Ebola, SARS are very important to us even though it is of less academic interest. Coronaviruses are a group of RNA virus which causes respiratory illness in birds as well as in animals. The COVID – 19 pandemic is caused due to SARS CoV – 2 virus. The book discusses in detail the origin, list of outbreaks, genome and it morphology, epidemiology which includes the details of host and reservoir, transmission and spread, incubation period, signs and symptoms, complications, high risk groups and diagnosis and treatment, pathogenesis, prophylaxis and the impacts of COVID – 19 worldwide. Dr Sudeepa E S