The extracellular infectious virus particle is called “virion”. Virus diseases range from the minor common cold to sporadic and endemic diseases such as mumps, hepatitis and so on. Viruses are of medical importance because they have the ability to cause a very large number of human diseases. However, inside living cells, viruses show some of the characteristics of living things. Outside of the host cells, viruses are inactive. Unlike other microorganism, complex processes are involved in their multiplication. They depend on the host machinery for their growth and survival. They lack cellular organizations and contain only one type nucleic acids, either DNA or RNA.Viruses are obligate intracellular parasites and lack the enzyme necessary for protein and nucleic acid synthesis. Viruses do not fall in the category of unicellular microorganism. To study the different routes of viral inoculation in the embryonated eggs.
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