Virology is a science which deals with the smallest organism of the world and action played with all the creative. The specialty of this organisms is to select all creative as host having no own house. Moreover, this organism is globally under stood because of its destructive nature and life espionage (eg. human being, animals and bacteria). In plant kingdoms it causes considerable damage to several crops including economics crop very significantly. Subject virology has widened during last decades but there is no any book where in a systematic approach have been followed in documenting the facts which may serve the purpose of student as per the university grant commission syllabus. The present book i sbeing written for the purpose to provide all information about viruses, its effect with hosts as per the syllabus of UGC(University Grants Commission) Deans Committee report in view of its effect on Human Being, Animals, Plants and Other creatures after selecting the host. The effort is have been made to write this book which may be very easy to understand by the student of under graduate and post graduate levels, as several illustration have been given for its better understanding. The special efforts have been done in stating several diseases of human beings, animals and plant kingdoms with their economic importance to popularize among the readers. In this book precautionary measures have been followed to elaborate the aspects separately with DNA and RNA with contrast to diseases caused in several creatures.

Keeping in mind, the teaching requirements and demands of literature it was describe to update all documents through this book so as to provide recent information of the advancements made in the field of virology.

The book is primarily intended for students, scholars and scientist engaged in teaching of virology in different disciplines at University level. The content of this book are widely divided for easy understanding of readers.