Virus is obligate intracellular, non- filterable, ultra-microscopic parasite. Which require living animal, plant or bacterial cell for their reproduction. It has both characters, non- living ( outside the body / cell ) Living ( in the body ) It has some unique features such as:- ① It has only one nucleic acid either DNA or RNA . ② It does'nt contain energy generating enzyme ATP . ③ Like inorganic matters, it can be cry stallised . ④ It passes through eclipse phase during invasion into host cell . ⑤ It is capable of bringing change in metabolic behavior of infected cell . ⑥ Some virus produce inclusion bodies ( group of viruses in cytoplasm ) in infected cell help in their diagnosis . ...
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