In the fast changing environment keeping vigil on the infectious disease agents has become international imperative. Amongst infectious agents viruses are the most frequently changing and emerging as more pathogenic agents and also several viral agents have jumped the species in the past three decades. Besides emerging and re-emerging diseases existing diseases continue to causes serious economic losses to livestock and poultry industry by way of morbidity mortality loss in milk meat and egg production.

This book covers topics related to virus research current developments and advancement. There are two parts in this book contributed by very experienced authors from top animal science institutions. The part I deals with various important diseases of birds porcine large and small ruminants. This part also includes viral diseases of public health significance like Nipah and several other emerging and re-emerging pathogens including influenza viruses of equine swine and binds.