Viruses are generally classified on the basis of morphology and nucleic acid. they contain. On the basis of morphology, viruses are classified into rod-shaped (T.M.V), spherical (Polio virus) and tadpole ( Bacteriophage ). The nucleic acid present may be DNA or RNA which may be naked enveloped or complex. Recently, viruses are classified on the pattern to their diversity. The diversity of the viruses is great and is almost certainly related to their modes of origin. To provide a systematic idea of some of this diversity, we will discuss the viruses under eight main headings.
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