104) ****In case of viral infection and virulence a. If the lethal dose 50/ml for virus A is 103 /ml and for virus B is 102 /ml. then virus A is more virulent than B b. If the lethal dose 50/ml for virus A is 103 /ml and for virus B is 102/ml. then virus A is less infectious than B c. If the lethal dose 50/ml for virus A is 103 /ml and for virus B is 102 /ml. then virus A is more Infectious than B d. If the lethal dose 50/ml for virus A is 103 /ml and for virus B is 102 /ml. then virus B is more virulent than A.

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Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.