INTRODUCTION
Virus basics and the concept of Viral Fitness
This introductory chapter discusses what viruses are and how they fit into the living world. Topics covered include the three large families in the living world: bacteria, archaea, and eukarya; viruses never really die; all life forms can be divided into species, but viruses cannot; and viruses can be distinguished from each other genetically.
Keywords: viruses, living world, fitness, survival, viral genes
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